write the network part for a multiplayer game

So, I'm developing a simple multiplayer game with a group. I'm in charge of the network part of this app. But I don't have time, so I need someone to help me with it. For this game, every player has a couple music instrument, and when joining together, they can play a song, and record it. This game should support create room as server, join room as client. And the players are connected by local network using wifi, no need to go on internet. So, I'm in charge of the the underling network development, and other people take care of everything else. Also, I need you to write a little document about the code, telling me what's it is doing , and how it is implemented, so that I can communicate with other people in the group.