Add game system

android/gradle.properties

lib/cubit/game_cubit.dart

lib/cubit/game_state.dart

lib/models/game/game.dart

lib/models/game/game_board.dart

lib/models/game/game_cell.dart

lib/models/game/game_settings.dart

lib/models/game_data.dart

lib/ui/painters/cell_painter.dart

lib/ui/screens/game_page.dart

lib/ui/widgets/game/game_board.dart

lib/ui/widgets/game/game_score.dart

lib/ui/widgets/game/game_settings.dart

lib/ui/widgets/game_board.dart

pubspec.lock

pubspec.yaml