Handle play and pause

[Breigner01]

Handle the fact that that every phone in the room can play pause or skip the music. It will need to implement a communication protocol between phones in order to send the commands.
For example, using 3 bits to send values between 0 and 7 (8 values) which will include play, pause, stop, next, previous.
As it is supposed to replicate watch2gether with music, the previous isn't necessary which would reduce the number of instructions and therefore the number of bits used for a command.