Implementing the constructor of GameController class
Implementing the getInstance () method to develop the singleton pattern
Implementing register_Game() method in GameController class
Implementing exclude_Game() method in GameController class
Implementing exclude_AllGame() method in GameController class
Implementing find_GameById() in GameController class
Implementing find_GameByName() in GameController class
Implementing include_Tournament() in GameController class
Implementing delete_Tournament() in GameController class
Merge branch 'GameController' into controller