Adds /users/:userId/roles route functionalities (GET, POST, DEL).
Adds /users/:userId/roles route functionalities (GET, POST, DEL).

RotaruDan/test-users,RotaruDan/test-users,RotaruDan/test-users,manuel-freire/a2,e-ucm/a2,e-ucm/a2,manuel-freire/a2,e-ucm/a2,manuel-freire/a2