Add new Kotlin Multiplatform project to gui.

gui/shared/composeResources/drawable/compose-multiplatform.xml

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+<vector
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="450dp"
+    android:height="450dp"
+    android:viewportWidth="64"
+    android:viewportHeight="64">
+  <path
+      android:pathData="M56.25,18V46L32,60 7.75,46V18L32,4Z"
+      android:fillColor="#6075f2"/>
+  <path
+      android:pathData="m41.5,26.5v11L32,43V60L56.25,46V18Z"
+      android:fillColor="#6b57ff"/>
+  <path
+      android:pathData="m32,43 l-9.5,-5.5v-11L7.75,18V46L32,60Z">
+    <aapt:attr name="android:fillColor">
+      <gradient
+          android:centerX="23.131"
+          android:centerY="18.441"
+          android:gradientRadius="42.132"
+          android:type="radial">
+        <item android:offset="0" android:color="#FF5383EC"/>
+        <item android:offset="0.867" android:color="#FF7F52FF"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+  <path
+      android:pathData="M22.5,26.5 L32,21 41.5,26.5 56.25,18 32,4 7.75,18Z">
+    <aapt:attr name="android:fillColor">
+      <gradient
+          android:startX="44.172"
+          android:startY="4.377"
+          android:endX="17.973"
+          android:endY="34.035"
+          android:type="linear">
+        <item android:offset="0" android:color="#FF33C3FF"/>
+        <item android:offset="0.878" android:color="#FF5383EC"/>
+      </gradient>
+    </aapt:attr>
+  </path>
+  <path
+      android:pathData="m32,21 l9.526,5.5v11L32,43 22.474,37.5v-11z"
+      android:fillColor="#000000"/>
+</vector>

gui/shared/module.yaml

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+product:
+  type: kmp/lib
+  platforms: [ jvm, android ]
+
+dependencies:
+  - $compose.runtime
+  - $compose.foundation
+  - $compose.material3
+  - $compose.ui
+  - $compose.components.resources
+  - $compose.preview
+  - $compose.hotReload.runtimeApi
+  - $libs.androidx.lifecycle.viewmodel.compose
+  - $libs.androidx.lifecycle.runtime.compose
+
+dependencies@android:
+  - $compose.uiTooling
+
+settings:
+  compose:
+    enabled: true
+    resources:
+      packageName: com.hyperling.weather.resources
+      # Generate public accessors so other modules (and previews) can use Res.*
+      exposedAccessors: true

gui/shared/src/App.kt

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+package com.hyperling.weather
+
+import androidx.compose.animation.AnimatedVisibility
+import androidx.compose.foundation.Image
+import androidx.compose.foundation.background
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.safeContentPadding
+import androidx.compose.material3.Button
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.Text
+import androidx.compose.runtime.*
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import org.jetbrains.compose.reload.DevelopmentEntryPoint
+import org.jetbrains.compose.resources.painterResource
+
+import com.hyperling.weather.resources.Res
+import com.hyperling.weather.resources.compose_multiplatform
+
+@Composable
+@Preview
+@DevelopmentEntryPoint
+fun App() {
+    MaterialTheme {
+        var showContent by remember { mutableStateOf(false) }
+        Column(
+            modifier = Modifier
+                .background(MaterialTheme.colorScheme.primaryContainer)
+                .safeContentPadding()
+                .fillMaxSize(),
+            horizontalAlignment = Alignment.CenterHorizontally,
+        ) {
+            Button(onClick = { showContent = !showContent }) {
+                Text("Click me!")
+            }
+            AnimatedVisibility(showContent) {
+                val greeting = remember { Greeting().greet() }
+                Column(
+                    modifier = Modifier.fillMaxWidth(),
+                    horizontalAlignment = Alignment.CenterHorizontally,
+                ) {
+                    Image(painterResource(Res.drawable.compose_multiplatform), null)
+                    Text("Compose: $greeting")
+                }
+            }
+        }
+    }
+}

gui/shared/src/Greeting.kt

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+package com.hyperling.weather
+
+class Greeting {
+    private val platform = getPlatform()
+
+    fun greet(): String {
+        return "Hello, ${platform.name}!"
+    }
+}

gui/shared/src/Platform.kt

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+package com.hyperling.weather
+
+interface Platform {
+    val name: String
+}
+
+expect fun getPlatform(): Platform

gui/shared/src@android/Platform.android.kt

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+package com.hyperling.weather
+
+import android.os.Build
+
+class AndroidPlatform : Platform {
+    override val name: String = "Android ${Build.VERSION.SDK_INT}"
+}
+
+actual fun getPlatform(): Platform = AndroidPlatform()

gui/shared/src@jvm/Platform.jvm.kt

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+package com.hyperling.weather
+
+class JVMPlatform: Platform {
+    override val name: String = "Java ${System.getProperty("java.version")}"
+}
+
+actual fun getPlatform(): Platform = JVMPlatform()

gui/shared/test/PlatformTest.kt

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+package com.hyperling.weather
+
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertTrue
+
+class PlatformTest {
+    @Test
+    fun `platform name is reported`() {
+        assertTrue(getPlatform().name.isNotBlank())
+    }
+
+    @Test
+    fun `greeting is built from the platform name`() {
+        assertEquals("Hello, ${getPlatform().name}!", Greeting().greet())
+    }
+}

gui/shared/test@android/PlatformAndroidTest.kt

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+package com.hyperling.weather
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class PlatformAndroidTest {
+    @Test
+    fun `platform name is reported`() {
+        assertTrue(getPlatform().name.isNotBlank())
+    }
+}

gui/shared/test@jvm/PlatformJvmTest.kt

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+package com.hyperling.weather
+
+import kotlin.test.Test
+import kotlin.test.assertTrue
+
+class PlatformJvmTest {
+    @Test
+    fun `platform name is reported`() {
+        assertTrue(getPlatform().name.isNotBlank())
+    }
+}