Add a widget to denote that a portion of the app is under construction

frontend/memoree_client/lib/app/widgets/wip.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+
+class WIP extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      child: Center(
+        child: Column(
+          mainAxisSize: MainAxisSize.min,
+          children: [
+            Icon(
+              Icons.handyman,
+              size: 100
+            ),
+            SizedBox(
+              height: 15,
+            ),
+            Text("Construction in progress. Please come back later."),
+          ],
+        ),
+      ),
+    );
+  }
+}

frontend/memoree_client/pubspec.lock

@@ -9,7 +9,7 @@ packages:
     source: hosted
     version: "1.6.0"
   async:
-    dependency: transitive
+    dependency: "direct main"
     description:
       name: async
       url: "https://pub.dartlang.org"

frontend/memoree_client/pubspec.yaml

@@ -23,6 +23,7 @@ environment:
 dependencies:
   flutter:
     sdk: flutter
+  async: ^2.4.2
   cloud_functions: ^0.7.2
   cupertino_icons: ^1.0.0
   easy_web_view: ^1.3.1