add node express skeleton
Define music schema, app configuration and script to seed DB with initial music list
Added basic tests for music model
add db seed populator
add user model
clean up music model test by removing unused variables
Modify music category variable name to genre
implemented functions and tests for adding followees and musics listened to user
implement and add tests for POST /follow controller
implement and add tests for POST /listen controller
fix music model test to only delete the music objects that it creates
implement the music recommendation engine
Merge branch 'feature/controllers'
Merge branch 'feature/music-recommendation-engine'