add RecyclerViewSampleKtTest

[lucasribolli]

Add Kotlin RecyclerView Espresso testing. It's the same idea of BasicSample, that is, same tests and comments in Java and Kotlin.

[google-cla[bot]]

Thanks for your pull request! It looks like this may be your first contribution to a Google open source project. Before we can look at your pull request, you'll need to sign a Contributor License Agreement (CLA).

For more information, open the CLA check for this pull request.