Create hello world android app in kotlin

I am doing this, as kotlin is concise /small code for same functionality.

target: 15 minutes

kotlin android reference: https://kotlinlang.org/docs/tutorials/kotlin-android.html
kotlin reference: https://kotlinlang.org/docs/tutorials/

hands on kotlin
https://try.kotlinlang.org/#/Kotlin%20Koans/Introduction/Hello,%20world!/Task.kt