大幅変更＆環境バージョンアップ

lib/provider/game_state_provider.dart

@@ -0,0 +1,22 @@
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:gifunavi/model/game_state_instance.dart';
+
+final gameStateNotifierProvider =
+    StateNotifierProvider<GameStaticState, GameInsStatetance>((ref) {
+  return GameStaticState();
+});
+
+class GameStaticState extends StateNotifier<GameInsStatetance> {
+  GameStaticState() : super(GameInsStatetance());
+
+  @override
+  GameInsStatetance get state => super.state;
+
+  void startGame(GameInsStatetance gi) {
+    state = gi;
+  }
+
+  void doCheckin() {}
+
+  void makeGoal() {}
+}