Add multiplatform empty project

.github/ISSUE_TEMPLATE

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+### Steps to reproduce
+
+1. Log in
+2. Open this screen
+3. ...
+
+### Expected behaviour
+
+*Explain what are you expecting to see*
+
+### Actual behavior
+
+*Describe the current behavior and why it is wrong*</td>

.github/PULL_REQUEST_TEMPLATE

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+### :pushpin: References
+* **Issue:** fixes _your issue goes here_
+* **Related pull-requests:** _list of related pull-requests (comma-separated): #1, #2_
+
+### :memo: Notes
+
+_Additional notes for reviewers, point them to the sections you want them to review more carefully, questions you may have, etc_
+
+### :tophat: What is the goal?
+
+_Provide a description of the overall goal (you can usually copy the one from the issue)_
+
+### :memo: How is it being implemented?
+
+_Provide a description of the implementation_
+
+### :boom: How can it be tested?
+
+_If it cannot be tested explain why._
+
+- [ ] **Use case 1:** _A brief description of the use case that should be tested_
+- [ ] **Use case 2:** _If the use case requires some complex steps, increase indentation_
+  - [ ] _Step 1_
+  - [ ] _Step 2_

.gitignore

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+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+logs
+target
+/.idea
+/.idea_modules
+/.classpath
+/.project
+/.settings
+.vscode
+/RUNNING_PID
+**/.DS_Store
+.gradle/
+build
+out/
+.kotlintest
+local.properties
+*.iml
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*

app/build.gradle

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+plugins {
+    id 'kotlin-multiplatform' version '1.3.21'
+}
+repositories {
+    google()
+    jcenter()
+    mavenCentral()
+}
+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android-extensions'
+
+android {
+    compileSdkVersion 28
+    defaultConfig {
+        applicationId 'com.karumi.dribbble.app'
+        minSdkVersion 15
+        targetSdkVersion 28
+        versionCode 1
+        versionName '1.0'
+        testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+        }
+    }
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'com.android.support:appcompat-v7:28.0.0'
+    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
+    androidTestImplementation 'com.android.support.test:runner:1.0.2'
+}
+
+kotlin {
+    android("android")
+    // This is for iPhone emulator
+    // Switch here to iosArm64 (or iosArm32) to build library for iPhone device
+    iosX64("ios") {
+        compilations.main.outputKinds("framework")
+    }
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation kotlin('stdlib-common')
+            }
+        }
+        commonTest {
+            dependencies {
+        		implementation kotlin('test-common')
+        		implementation kotlin('test-annotations-common')
+            }
+        }
+        androidMain {
+            dependencies {
+                implementation kotlin('stdlib')
+            }
+        }
+        androidTest {
+            dependencies {
+                implementation kotlin('test')
+                implementation kotlin('test-junit')
+            }
+        }
+        iosMain {
+        }
+        iosTest {
+        }
+    }
+}
+
+// This task attaches native framework built from ios module to Xcode project
+// (see iosApp directory). Don't run this task directly,
+// Xcode runs this task itself during its build process.
+// Before opening the project from iosApp directory in Xcode,
+// make sure all Gradle infrastructure exists (gradle.wrapper, gradlew).
+task copyFramework {
+    def buildType = project.findProperty('kotlin.build.type') ?: 'DEBUG'
+    def target = project.findProperty('kotlin.target') ?: 'ios'
+    dependsOn kotlin.targets."$target".compilations.main.linkTaskName('FRAMEWORK', buildType)
+
+    doLast {
+        def srcFile = kotlin.targets."$target".compilations.main.getBinary('FRAMEWORK', buildType)
+        def targetDir = getProperty('configuration.build.dir')
+        copy {
+            from srcFile.parent
+            into targetDir
+            include 'app.framework/**'
+            include 'app.framework.dSYM'
+        }
+    }
+}

app/src/commonMain/kotlin/sample/Sample.kt

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+package sample
+
+expect class Sample() {
+    fun checkMe(): Int
+}
+
+expect object Platform {
+    val name: String
+}
+
+fun hello(): String = "Hello from ${Platform.name}"
+
+class Proxy {
+    fun proxyHello() = hello()
+}
+
+fun main() {
+    println(hello())
+}

app/src/commonTest/kotlin/sample/SampleTests.kt

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+package sample
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class SampleTests {
+    @Test
+    fun testMe() {
+        assertTrue(Sample().checkMe() > 0)
+    }
+
+    @Test
+    fun testProxy() {
+        assertTrue(Proxy().proxyHello().isNotEmpty())
+    }
+}

app/src/iosMain/kotlin/sample/SampleIos.kt

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+package sample
+
+actual class Sample {
+    actual fun checkMe() = 7
+}
+
+actual object Platform {
+    actual val name: String = "iOS"
+}

app/src/iosTest/kotlin/sample/SampleTestsIOS.kt

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+package sample
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class SampleTestsIOS {
+    @Test
+    fun testHello() {
+        assertTrue("iOS" in hello())
+    }
+}

app/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="sample">
+
+    <application
+            android:allowBackup="true"
+            android:label="@string/app_name"
+            android:supportsRtl="true"
+            android:theme="@style/AppTheme">
+        <activity android:name="sample.MainActivity">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/sample/SampleAndroid.kt

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+package sample
+
+import android.support.v7.app.AppCompatActivity
+import android.os.Bundle
+
+actual class Sample {
+    actual fun checkMe() = 44
+}
+
+actual object Platform {
+    actual val name: String = "Android"
+}
+
+class MainActivity : AppCompatActivity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        hello()
+        Sample().checkMe()
+        setContentView(R.layout.activity_main)
+    }
+}

app/src/main/res/layout/activity_main.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</android.support.constraint.ConstraintLayout>

app/src/main/res/values/strings.xml

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+<resources>
+    <string name="app_name">android-app</string>
+</resources>

app/src/main/res/values/styles.xml

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+<resources>
+    <!-- Base application theme. -->
+    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

app/src/test/java/sample/SampleTestsAndroid.kt

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+package sample
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class SampleTestsAndroid {
+    @Test
+    fun testHello() {
+        assertTrue("Android" in hello())
+    }
+}

build.gradle

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+buildscript {
+    repositories {
+        google()
+        jcenter()
+    }
+    dependencies {
+        classpath 'com.android.tools.build:gradle:3.3.2'
+    }
+}
+repositories {
+    google()
+    jcenter()
+}

gradle.properties

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+kotlin.code.style=official

gradle/wrapper/gradle-wrapper.properties

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+#Tue Mar 05 11:07:19 CET 2019
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-4.7-all.zip