[add] Counter view to finish and minimization

[add] Overlay counter view

[add] Overlay move view

[add] SharedPreferences manager

[add] Main service class

[add] Application class

[add] Firebase

[add] Realm

[add] Android Architecture Components for Lifecycles, LiveData, and ViewModel

[add] Kotlin SourceSets

[add] Enable DataBinding

[add] Project

Initial commit