"Hello World" android app using kotlin

	Kotlin's "Hello, world!" on Android  1)KotlinActivity.kt :
	import android.app.Activity
	import android.os.Bundle
	class HelloKotlin() : Activity() {
	protected override fun onCreate(savedInstanceState : Bundle?) {
	super<Activity>.onCreate(savedInstanceState)
	setContentView(R.layout.main)
	}
	}