Create basic UI (panels) for main window. Add menu to main window. Only Start option is implemented. Create simple wizard to ask user the information to start game.
Game.java - Implement Singleton pattern. Instance of Game object can be safely called as Game.getInstance() from any class. 
MainWindow.java - Add panel to show user information. Temporally only text is shown. Will be replaced later by icons
Add Menu items (Load config, Save Config, Start New Game, Show Next User)