Function notifyNewMatch

notifyNewMatch(
    usernameA: string,
    usernameB: string,
    matchId: string,
): Promise<void>
Notifies the players that a match has been found and adds them to the match room.
Parameters
- usernameA: string
  the username of the first player
- usernameB: string
  the username of the second player
- matchId: string
  the id of the match
Returns Promise<void>
- Defined in src/controllers/matchmaking.ts:46