Merge pull request #1 from Koducation/viewstate_unit_test

write test for getPlayPauseIconClicable method of PlayerViewStateTest

Player radio using exoplayer.

Create databasemodule and app module to inject into datasources.

Create AppComponent.

Add shared viewmodel to controlling favorite operation.

Add room persistence implementation to persist and query favorite radios.

Add viewmodel and livedata.

Create viewstate for databinding <data>

Introduction to databinding.

Merge remote-tracking branch 'origin/master'

Add RxJava, RxAndroid, Retrofit Rx call adapter dependencies.

Update README.md

Add Retrofit dependency.

Add resources.