Added provider for games

lib/models/game.dart

@@ -1,8 +1,10 @@
 class Game {
   final int id;
   final String name;
+  final List<Map<String, dynamic>> rewards;
 
-  Game.fromMap(Map<String, dynamic> map)
+  Game.fromMap(Map<String, dynamic> map, Iterable<Map<String, dynamic>> rewards)
       : id = map['id'],
-        name = map['name'];
+        name = map['name'],
+        rewards = rewards.toList();
 }