Added more UTs for ViewModel

Added more UTs

More UTs for use cases and reactive store

Added UT for get movie use case

default poster path to empty string if null

Add infite loading

Completed flow for showing movie details

Complete flow for showing movies list

Created view model for movies list and also created layout and DI modules

Completed movies repository in data layer

Added DI modules

Created data layer models and retofit API. Created domain layer use cases for commuicating with the Repository

Merge branch 'master' of github.com:mayojava/TheMovies

Initial commit

Added base classes for use case and observer