Add project files.

.vsconfig

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+{
+  "version": "1.0",
+  "components": [
+    "Microsoft.VisualStudio.Component.CoreEditor",
+    "Microsoft.VisualStudio.Workload.CoreEditor",
+    "Microsoft.NetCore.Component.Runtime.3.1",
+    "Microsoft.NetCore.Component.SDK",
+    "Microsoft.VisualStudio.Component.NuGet",
+    "Microsoft.VisualStudio.Component.Roslyn.Compiler",
+    "Microsoft.VisualStudio.Component.Roslyn.LanguageServices",
+    "Microsoft.NetCore.Component.DevelopmentTools",
+    "Microsoft.VisualStudio.ComponentGroup.WebToolsExtensions",
+    "Microsoft.VisualStudio.Component.DockerTools",
+    "Microsoft.NetCore.Component.Web",
+    "Microsoft.Net.ComponentGroup.DevelopmentPrerequisites",
+    "Microsoft.VisualStudio.Component.TypeScript.4.0",
+    "Microsoft.VisualStudio.Component.JavaScript.TypeScript",
+    "Microsoft.VisualStudio.Component.JavaScript.Diagnostics",
+    "Microsoft.Component.MSBuild",
+    "Microsoft.VisualStudio.Component.TextTemplating",
+    "Component.Microsoft.VisualStudio.RazorExtension",
+    "Microsoft.VisualStudio.Component.IISExpress",
+    "Microsoft.VisualStudio.Component.SQL.ADAL",
+    "Microsoft.VisualStudio.Component.SQL.LocalDB.Runtime",
+    "Microsoft.VisualStudio.Component.Common.Azure.Tools",
+    "Microsoft.VisualStudio.Component.SQL.CLR",
+    "Microsoft.VisualStudio.Component.MSODBC.SQL",
+    "Microsoft.VisualStudio.Component.MSSQL.CMDLnUtils",
+    "Microsoft.VisualStudio.Component.ManagedDesktop.Core",
+    "Microsoft.VisualStudio.Component.SQL.SSDT",
+    "Microsoft.VisualStudio.Component.SQL.DataSources",
+    "Component.Microsoft.Web.LibraryManager",
+    "Microsoft.VisualStudio.ComponentGroup.Web",
+    "Microsoft.VisualStudio.Component.Web",
+    "Microsoft.VisualStudio.Component.IntelliCode",
+    "Component.Microsoft.VisualStudio.LiveShare",
+    "Microsoft.VisualStudio.ComponentGroup.Web.Client",
+    "Microsoft.Net.ComponentGroup.TargetingPacks.Common",
+    "Component.Microsoft.VisualStudio.Web.AzureFunctions",
+    "Microsoft.VisualStudio.ComponentGroup.AzureFunctions",
+    "Microsoft.VisualStudio.Component.Azure.Compute.Emulator",
+    "Microsoft.VisualStudio.Component.Azure.Storage.Emulator",
+    "Microsoft.VisualStudio.Component.Azure.ClientLibs",
+    "Microsoft.VisualStudio.Component.Azure.AuthoringTools",
+    "Microsoft.VisualStudio.Component.CloudExplorer",
+    "Microsoft.VisualStudio.ComponentGroup.Web.CloudTools",
+    "Microsoft.VisualStudio.Component.DiagnosticTools",
+    "Microsoft.VisualStudio.Component.EntityFramework",
+    "Microsoft.VisualStudio.Component.AspNet45",
+    "Microsoft.VisualStudio.Component.AppInsights.Tools",
+    "Microsoft.VisualStudio.Component.WebDeploy",
+    "Microsoft.VisualStudio.Workload.NetWeb",
+    "Microsoft.VisualStudio.ComponentGroup.Azure.Prerequisites",
+    "Microsoft.VisualStudio.Component.Azure.Waverton.BuildTools",
+    "Microsoft.VisualStudio.Component.Azure.Waverton",
+    "Microsoft.Component.Azure.DataLake.Tools",
+    "Microsoft.VisualStudio.Component.Azure.Kubernetes.Tools",
+    "Microsoft.VisualStudio.Component.Azure.ResourceManager.Tools",
+    "Microsoft.VisualStudio.ComponentGroup.Azure.ResourceManager.Tools",
+    "Microsoft.VisualStudio.ComponentGroup.Azure.CloudServices",
+    "Microsoft.VisualStudio.Component.Azure.ServiceFabric.Tools",
+    "Microsoft.VisualStudio.Workload.Azure",
+    "Microsoft.VisualStudio.Component.VC.CoreIde",
+    "Microsoft.VisualStudio.Component.VC.Tools.x86.x64",
+    "Microsoft.VisualStudio.Component.Graphics.Tools",
+    "Microsoft.VisualStudio.Component.Windows10SDK.19041",
+    "Microsoft.VisualStudio.Component.ManagedDesktop.Prerequisites",
+    "Microsoft.ComponentGroup.Blend",
+    "Microsoft.VisualStudio.Component.Debugger.JustInTime",
+    "Microsoft.VisualStudio.ComponentGroup.MSIX.Packaging",
+    "Microsoft.VisualStudio.Workload.ManagedDesktop",
+    "Microsoft.VisualStudio.Component.Windows10SDK.18362",
+    "Microsoft.Component.NetFX.Native",
+    "Microsoft.VisualStudio.ComponentGroup.UWP.NetCoreAndStandard",
+    "Microsoft.VisualStudio.Component.Graphics",
+    "Microsoft.VisualStudio.ComponentGroup.UWP.Xamarin",
+    "Microsoft.VisualStudio.ComponentGroup.UWP.Support",
+    "Microsoft.VisualStudio.Component.VC.Tools.ARM64",
+    "Microsoft.VisualStudio.Component.UWP.VC.ARM64",
+    "Microsoft.VisualStudio.Component.VC.Tools.ARM",
+    "Microsoft.VisualStudio.ComponentGroup.UWP.VC",
+    "Microsoft.VisualStudio.Workload.Universal",
+    "Component.OpenJDK",
+    "Microsoft.VisualStudio.Component.MonoDebugger",
+    "Microsoft.VisualStudio.Component.Merq",
+    "Component.Xamarin.RemotedSimulator",
+    "Microsoft.VisualStudio.ComponentGroup.WebToolsExtensions.TemplateEngine",
+    "Component.Xamarin",
+    "Component.Android.SDK28",
+    "Microsoft.VisualStudio.Workload.NetCrossPlat",
+    "Microsoft.VisualStudio.Workload.NetCoreTools",
+    "Microsoft.VisualStudio.ComponentGroup.Maui.All",
+  ]
+}

Astro-Odyssey-Uno-Platform.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.2.32630.192
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{D954291E-2A0B-460D-934E-DC6B0785DB48}") = "AstroOdyssey.Shared", "AstroOdyssey\AstroOdyssey.Shared\AstroOdyssey.Shared.shproj", "{6279C845-92F8-4333-AB99-3D213163593C}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Platforms", "Platforms", "{C78ECF62-6B65-4C3A-9B84-95FE33CFC895}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AstroOdyssey.Wasm", "AstroOdyssey\AstroOdyssey.Wasm\AstroOdyssey.Wasm.csproj", "{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{AB4C7926-73BC-4ABA-A3C3-1704069CBBAC} = {C78ECF62-6B65-4C3A-9B84-95FE33CFC895}
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {633360BA-A180-42B0-8CAD-A99A4CB7FF2A}
+	EndGlobalSection
+	GlobalSection(SharedMSBuildProjectFiles) = preSolution
+		AstroOdyssey\AstroOdyssey.Shared\AstroOdyssey.Shared.projitems*{6279c845-92f8-4333-ab99-3d213163593c}*SharedItemsImports = 13
+		AstroOdyssey\AstroOdyssey.Shared\AstroOdyssey.Shared.projitems*{ab4c7926-73bc-4aba-a3c3-1704069cbbac}*SharedItemsImports = 5
+	EndGlobalSection
+EndGlobal

AstroOdyssey/AstroOdyssey.Shared/App.xaml

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+<Application
+    x:Class="AstroOdyssey.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:AstroOdyssey">
+
+    <Application.Resources>
+        <ResourceDictionary>
+            <ResourceDictionary.MergedDictionaries>
+                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
+                <!-- Add resource dictionaries here -->                
+            </ResourceDictionary.MergedDictionaries>
+            <!-- Add resources here -->
+        </ResourceDictionary>
+    </Application.Resources>
+
+</Application>

AstroOdyssey/AstroOdyssey.Shared/App.xaml.cs

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+using Microsoft.Extensions.Logging;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using Windows.ApplicationModel;
+using Windows.ApplicationModel.Activation;
+
+namespace AstroOdyssey
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public sealed partial class App : Application
+    {
+        private Window _window;
+
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            InitializeLogging();
+
+            this.InitializeComponent();
+
+#if HAS_UNO || NETFX_CORE
+            this.Suspending += OnSuspending;
+#endif
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="args">Details about the launch request and process.</param>
+        protected override void OnLaunched(Microsoft.UI.Xaml.LaunchActivatedEventArgs args)
+        {
+#if DEBUG
+            if (System.Diagnostics.Debugger.IsAttached)
+            {
+                // this.DebugSettings.EnableFrameRateCounter = true;
+            }
+#endif
+
+#if NET6_0_OR_GREATER && WINDOWS && !HAS_UNO
+            _window = new Window();
+            _window.Activate();
+#else
+            _window = Microsoft.UI.Xaml.Window.Current;
+#endif
+
+            var rootFrame = _window.Content as Frame;
+
+            // Do not repeat app initialization when the Window already has content,
+            // just ensure that the window is active
+            if (rootFrame == null)
+            {
+                // Create a Frame to act as the navigation context and navigate to the first page
+                rootFrame = new Frame();
+
+                rootFrame.NavigationFailed += OnNavigationFailed;
+
+                if (args.UWPLaunchActivatedEventArgs.PreviousExecutionState == ApplicationExecutionState.Terminated)
+                {
+                    // TODO: Load state from previously suspended application
+                }
+
+                // Place the frame in the current Window
+                _window.Content = rootFrame;
+            }
+
+#if !(NET6_0_OR_GREATER && WINDOWS)
+            if (args.UWPLaunchActivatedEventArgs.PrelaunchActivated == false)
+#endif
+            {
+                if (rootFrame.Content == null)
+                {
+                    // When the navigation stack isn't restored navigate to the first page,
+                    // configuring the new page by passing required information as a navigation
+                    // parameter
+                    rootFrame.Navigate(typeof(MainPage), args.Arguments);
+                }
+                // Ensure the current window is active
+                _window.Activate();
+            }
+        }
+
+        /// <summary>
+        /// Invoked when Navigation to a certain page fails
+        /// </summary>
+        /// <param name="sender">The Frame which failed navigation</param>
+        /// <param name="e">Details about the navigation failure</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new InvalidOperationException($"Failed to load {e.SourcePageType.FullName}: {e.Exception}");
+        }
+
+        /// <summary>
+        /// Invoked when application execution is being suspended.  Application state is saved
+        /// without knowing whether the application will be terminated or resumed with the contents
+        /// of memory still intact.
+        /// </summary>
+        /// <param name="sender">The source of the suspend request.</param>
+        /// <param name="e">Details about the suspend request.</param>
+        private void OnSuspending(object sender, SuspendingEventArgs e)
+        {
+            var deferral = e.SuspendingOperation.GetDeferral();
+            //TODO: Save application state and stop any background activity
+            deferral.Complete();
+        }
+
+        /// <summary>
+        /// Configures global Uno Platform logging
+        /// </summary>
+        private static void InitializeLogging()
+        {
+#if DEBUG
+            // Logging is disabled by default for release builds, as it incurs a significant
+            // initialization cost from Microsoft.Extensions.Logging setup. If startup performance
+            // is a concern for your application, keep this disabled. If you're running on web or 
+            // desktop targets, you can use url or command line parameters to enable it.
+            //
+            // For more performance documentation: https://platform.uno/docs/articles/Uno-UI-Performance.html
+
+            var factory = LoggerFactory.Create(builder =>
+            {
+#if __WASM__
+                builder.AddProvider(new global::Uno.Extensions.Logging.WebAssembly.WebAssemblyConsoleLoggerProvider());
+#elif __IOS__
+                builder.AddProvider(new global::Uno.Extensions.Logging.OSLogLoggerProvider());
+#elif NETFX_CORE
+                builder.AddDebug();
+#else
+                builder.AddConsole();
+#endif
+
+                // Exclude logs below this level
+                builder.SetMinimumLevel(LogLevel.Information);
+
+                // Default filters for Uno Platform namespaces
+                builder.AddFilter("Uno", LogLevel.Warning);
+                builder.AddFilter("Windows", LogLevel.Warning);
+                builder.AddFilter("Microsoft", LogLevel.Warning);
+
+                // Generic Xaml events
+                // builder.AddFilter("Windows.UI.Xaml", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.VisualStateGroup", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.StateTriggerBase", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.UIElement", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.FrameworkElement", LogLevel.Trace );
+
+                // Layouter specific messages
+                // builder.AddFilter("Windows.UI.Xaml.Controls", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.Controls.Layouter", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.Controls.Panel", LogLevel.Debug );
+
+                // builder.AddFilter("Windows.Storage", LogLevel.Debug );
+
+                // Binding related messages
+                // builder.AddFilter("Windows.UI.Xaml.Data", LogLevel.Debug );
+                // builder.AddFilter("Windows.UI.Xaml.Data", LogLevel.Debug );
+
+                // Binder memory references tracking
+                // builder.AddFilter("Uno.UI.DataBinding.BinderReferenceHolder", LogLevel.Debug );
+
+                // RemoteControl and HotReload related
+                // builder.AddFilter("Uno.UI.RemoteControl", LogLevel.Information);
+
+                // Debug JS interop
+                // builder.AddFilter("Uno.Foundation.WebAssemblyRuntime", LogLevel.Debug );
+            });
+
+            global::Uno.Extensions.LogExtensionPoint.AmbientLoggerFactory = factory;
+
+#if HAS_UNO
+            global::Uno.UI.Adapter.Microsoft.Extensions.Logging.LoggingAdapter.Initialize();
+#endif
+#endif
+        }
+    }
+}

AstroOdyssey/AstroOdyssey.Shared/Assets/SharedAssets.md

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+See documentation about assets here : https://github.com/unoplatform/uno/blob/master/doc/articles/features/working-with-assets.md
+
+# Here is a cheat sheet:
+
+1. Add the image file to the `Assets` directory of a shared project.
+2. Set the build action to `Content`.
+3. (Recommended) Provide an asset for various scales/dpi
+
+## Examples
+
+```
+\Assets\Images\logo.scale-100.png
+\Assets\Images\logo.scale-200.png
+\Assets\Images\logo.scale-400.png
+
+\Assets\Images\scale-100\logo.png
+\Assets\Images\scale-200\logo.png
+\Assets\Images\scale-400\logo.png
+```
+
+## Table of scales
+
+| Scale | UWP         | iOS      | Android |
+|-------|:-----------:|:--------:|:-------:|
+| `100` | scale-100   | @1x      | mdpi    |
+| `125` | scale-125   | N/A      | N/A     |
+| `150` | scale-150   | N/A      | hdpi    |
+| `200` | scale-200   | @2x      | xhdpi   |
+| `300` | scale-300   | @3x      | xxhdpi  |
+| `400` | scale-400   | N/A      | xxxhdpi |
+
+
+
+