/**
  * Calls the repo add player method,
  * Passing the retrieved User.
  *
  * @param int $userID
  * @param string $nickname
  *
  * @throws Illuminate\Database\Eloquent\ModelNotFoundException
  *
  * @return Player
  */
 public function addPlayer($userID, $nickname)
 {
     $user = $this->usersRepo->getUser($userID);
     return $this->playersRepo->addPlayer($user, $nickname);
 }