02a-room

[Serchinastico]

This PR is not meant to be merged

This is how to include Room inside the project:

• Include Room dependencies. We are including coroutines support to use suspend functions in the Dao.
• Create Database,Dao and Entity to store SuperHeroes. We are using all four CRUD methods.
• Include a migration, you can see the previous model before where we were storing the very same fields we were using for a SuperHero. Now we use the @Embedded annotation to get an object and split all its fields into fields of the table (preffixed with the string "superhero_").
• Replace LocalSuperHeroDataSource implementation by the new Room database.

[davideme]

👍