implement findRunningGamesOfUser-Method

fh.fd.ci.server/src/main/java/de/fd/fh/server/game/GameService.java

@@ -4,6 +4,7 @@ import de.fd.fh.server.user.UserId;
 import lombok.RequiredArgsConstructor;
 
 import java.util.HashSet;
+import java.util.List;
 import java.util.Set;
 
 @RequiredArgsConstructor
@@ -101,4 +102,9 @@ public class GameService
         }
         return null;
     }
+
+    public List<Game> findRunningGamesOfUser(final UserId userId)
+    {
+        return repository.findRunningGamesOfPlayer(userId);
+    }
 }