MAPG-235 basic gameflow works

src/Controller/GameController.php

@@ -244,7 +244,9 @@ class GameController
         if(!$this->userInChallengeRepository->isUserParticipatingInChallenge($userId, $challenge)) {
             $userInChallenge = new UserInChallenge();
             $userInChallenge->setUserId($userId);
+            $userInChallenge->setChallenge($challenge);
             $userInChallenge->setTimeLeft($challenge->getTimerSec());
+            $this->pdm->saveToDb($userInChallenge);
         }
 
         $map = $this->mapRepository->getByChallenge($challenge);