Add flutter_web samples (#75)

web/vision_challenge/lib/main.dart

@@ -0,0 +1,20 @@
+import 'package:flutter_web/material.dart';
+import 'package:vision_challenge/packages/flutter_redux.dart';
+import 'package:vision_challenge/packages/redux.dart';
+import 'game.dart';
+
+void main() {
+  final store = Store<AppState>(
+    reducer,
+    initialState: AppState.init(),
+  );
+
+  runApp(
+    StoreProvider<AppState>(
+      store: store,
+      child: MaterialApp(
+        home: Game(store),
+      ),
+    ),
+  );
+}