rockstars-2022

TODO:

1. Create persistance for all artists
2. Create endpoint for initialize artists
3. Create persistence for song list
4. Create endpoint for initialize songs
5. Add check for adding new song if not already exists (id and name should be unique)
6. Add getB artis by id and get song by id
7. Add put for artist and song
8. Add delete endpoint by id
9. Add new endpoint for favourite song /songs/favourite
10. Add playlist entity + persistence
11. Add playlist api