Add new Kotlin Multiplatform project to gui.

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

@@ -0,0 +1,9 @@
+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()