MAPG-235 basic gameflow works

src/Repository/PlaceInChallengeRepository.php

@@ -31,4 +31,13 @@ class PlaceInChallengeRepository
 
         yield from $this->pdm->selectMultipleFromDb($select, PlaceInChallenge::class);
     }
+
+    public function getByPlaceAndChallenge(Place $place, Challenge $challenge) : ?PlaceInChallenge
+    {
+        $select = new Select(\Container::$dbConnection);
+        $select->where('place_id', '=', $place->getId());
+        $select->where('challenge_id', '=', $challenge->getId());
+
+        return $this->pdm->selectFromDb($select, PlaceInChallenge::class);
+    }
 }