Merge branch '1-first-game-release' into 'master'

gradle/wrapper/gradle-wrapper.properties

gradlew

gradlew.bat

lib/config/application_config.dart

lib/cubit/activity/activity_cubit.dart

lib/cubit/activity/activity_state.dart

lib/data/game_data.dart

lib/main.dart

lib/models/activity/activity.dart

lib/models/activity/board.dart

lib/models/activity/cell.dart

lib/models/activity/cell_location.dart

lib/models/activity/types.dart

lib/ui/game/game_bottom.dart

lib/ui/game/game_end.dart

lib/ui/game/game_top.dart

lib/ui/pages/game.dart

lib/ui/parameters/parameter_painter_board_size.dart

lib/ui/parameters/parameter_painter_difficulty_level.dart

lib/ui/skeleton.dart