backend: Add Quarkus skeleton project

web_backend/quarkus-app/.dockerignore

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+*
+!target/*-runner
+!target/*-runner.jar
+!target/lib/*
+!target/quarkus-app/*

web_backend/quarkus-app/.gitignore

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+#Maven
+target/
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+release.properties
+.flattened-pom.xml
+
+# Eclipse
+.project
+.classpath
+.settings/
+bin/
+
+# IntelliJ
+.idea/*
+*.ipr
+*.iml
+*.iws
+# Allow some IntelliJ files
+!.idea/codeStyles/
+!.idea/checkstyle-idea.xml
+!.idea/google-java-format.xml
+
+# NetBeans
+nb-configuration.xml
+
+# Visual Studio Code
+.vscode
+.factorypath
+
+# OSX
+.DS_Store
+
+# Vim
+*.swp
+*.swo
+
+# patch
+*.orig
+*.rej
+
+# Local environment
+.env
+
+# Plugin directory
+/.quarkus/cli/plugins/

web_backend/quarkus-app/.mvn/wrapper/.gitignore

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+maven-wrapper.jar

web_backend/quarkus-app/.mvn/wrapper/MavenWrapperDownloader.java

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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *  http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.net.Authenticator;
+import java.net.PasswordAuthentication;
+import java.net.URL;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.nio.file.StandardCopyOption;
+
+public final class MavenWrapperDownloader
+{
+    private static final String WRAPPER_VERSION = "3.2.0";
+
+    private static final boolean VERBOSE = Boolean.parseBoolean( System.getenv( "MVNW_VERBOSE" ) );
+
+    public static void main( String[] args )
+    {
+        log( "Apache Maven Wrapper Downloader " + WRAPPER_VERSION );
+
+        if ( args.length != 2 )
+        {
+            System.err.println( " - ERROR wrapperUrl or wrapperJarPath parameter missing" );
+            System.exit( 1 );
+        }
+
+        try
+        {
+            log( " - Downloader started" );
+            final URL wrapperUrl = new URL( args[0] );
+            final String jarPath = args[1].replace( "..", "" ); // Sanitize path
+            final Path wrapperJarPath = Paths.get( jarPath ).toAbsolutePath().normalize();
+            downloadFileFromURL( wrapperUrl, wrapperJarPath );
+            log( "Done" );
+        }
+        catch ( IOException e )
+        {
+            System.err.println( "- Error downloading: " + e.getMessage() );
+            if ( VERBOSE )
+            {
+                e.printStackTrace();
+            }
+            System.exit( 1 );
+        }
+    }
+
+    private static void downloadFileFromURL( URL wrapperUrl, Path wrapperJarPath )
+        throws IOException
+    {
+        log( " - Downloading to: " + wrapperJarPath );
+        if ( System.getenv( "MVNW_USERNAME" ) != null && System.getenv( "MVNW_PASSWORD" ) != null )
+        {
+            final String username = System.getenv( "MVNW_USERNAME" );
+            final char[] password = System.getenv( "MVNW_PASSWORD" ).toCharArray();
+            Authenticator.setDefault( new Authenticator()
+            {
+                @Override
+                protected PasswordAuthentication getPasswordAuthentication()
+                {
+                    return new PasswordAuthentication( username, password );
+                }
+            } );
+        }
+        try ( InputStream inStream = wrapperUrl.openStream() )
+        {
+            Files.copy( inStream, wrapperJarPath, StandardCopyOption.REPLACE_EXISTING );
+        }
+        log( " - Downloader complete" );
+    }
+
+    private static void log( String msg )
+    {
+        if ( VERBOSE )
+        {
+            System.out.println( msg );
+        }
+    }
+
+}

web_backend/quarkus-app/.mvn/wrapper/maven-wrapper.properties

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+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.6/apache-maven-3.9.6-bin.zip
+wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar

web_backend/quarkus-app/README.md

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+<!-- markdownlint-disable-file -->
+<div align="center">
+  <h1>Teamagochi Web-Backend</h1>
+
+The backend for the Teamgochi project, build with the [Quarkus](https://quarkus.io) Java Framework.<br /><br />
+<strong>[Explore the docs](https://github.com/smartuni/teamagochi/tree/main/web_backend)</strong>
+</div>
+
+<!-- ~~~~~~~~~~~~~~~~~~~ END OF HEADER ~~~~~~~~~~~~~~~~~~~ -->
+
+## Usage
+
+The development environment can be started by using the [Quarkus CLI](https://quarkus.io/guides/cli-tooling),
+the `mvnw.cmd` script (Windows) or the equivalent `./mvnw` (Linux).
+
+```shell
+quarkus dev
+
+# Maven
+./mvnw compile quarkus:dev
+mvnw.cmd compile quarkus:dev
+```
+
+Run `quarkus --help`, `./mvnw quarkus --help` or `mvnw.cmd quarkus --help` to display help and all available commands.
+Read more about the [development mode](https://quarkus.io/guides/maven-tooling#dev-mode) or
+about the [command line interface](https://quarkus.io/guides/cli-tooling) in general.
+
+## Extensions
+
+The following table contains all used [Quarkus Extensions](https://quarkus.io/extensions/)
+
+| Name                       | Links                                                                                                                                    | Why?                                                                               |
+|----------------------------|------------------------------------------------------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------|
+| REST                       | [Docs](https://quarkus.io/guides/rest), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-rest)                                    | Create and provide REST services                                                   |
+| REST Jackson               | [Docs](https://quarkus.io/guides/rest#json-serialisation), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-rest-jackson/)        | Jackson serialization (JSON) support for REST extension                            |
+| REST Client                | [Docs](https://quarkus.io/guides/rest-client), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-rest-client/)                     | Call REST services, support receiving Server-sent events (SSE)                     |
+| REST Client Jackson        | [Info](https://quarkus.io/extensions/io.quarkus/quarkus-rest-client-jackson/)                                                            | Jackson serialization (JSON) support for the REST Client                           |
+| Hibernate ORM with Panache | [Docs](https://quarkus.io/guides/hibernate-orm-panache), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-hibernate-orm-panache/) | Domain model persistence for relational databases using the the repository pattern |
+| JDBC Driver - PostgreSQL   | [Docs](https://quarkus.io/guides/datasource), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-jdbc-postgresql/)                  | Connect to the PostreSQL database via JDBC                                         |
+| JDBC Driver - H2           | [Docs](https://quarkus.io/guides/datasource), [Info](https://quarkus.io/extensions/io.quarkus/quarkus-jdbc-h2/)                          | Connect to the H2 database via JDBC                                                |