add splash_screen.dart

add design of level list screen

lib/screens/level_list/screen/level_list_screen.dart

@@ -67,12 +67,21 @@ class _LevelListScreenState extends State<LevelListScreen> {
                   child: ListView.builder(
                     itemBuilder: (context, index) {
                       if (index == 0 || index == 1) {
-                        return LevelWidget(level: _levelList[index]);
+                        return GestureDetector(
+                          onTap: () => _startLevel(_levelList[index]),
+                          child: LevelWidget(level: _levelList[index]),
+                        );
                       }
                       if (index == 2) {
-                        return LockLevelWidget(level: _levelList[index]);
+                        return GestureDetector(
+                          child: LockLevelWidget(level: _levelList[index]),
+                          onTap: () => _startLevel(_levelList[index]),
+                        );
                       }
-                      return PayedLevelWidget(level: _levelList[index]);
+                      return GestureDetector(
+                        child: PayedLevelWidget(level: _levelList[index]),
+                        onTap: () => _startLevel(_levelList[index]),
+                      );
                     },
                     itemCount: _levelList.length,
                   ),