Add new Kotlin Multiplatform project to gui.

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

@@ -0,0 +1,7 @@
+package com.hyperling.weather
+
+class JVMPlatform: Platform {
+    override val name: String = "Java ${System.getProperty("java.version")}"
+}
+
+actual fun getPlatform(): Platform = JVMPlatform()