Implement message_list

flutter/lib/components/layout/scaffold.dart

@@ -0,0 +1,19 @@
+import 'package:flutter/material.dart';
+import 'package:simplecloudnotifier/components/layout/app_bar.dart';
+
+class SCNScaffold extends StatelessWidget {
+  const SCNScaffold({Key? key, required this.child, this.title}) : super(key: key);
+
+  final Widget child;
+  final String? title;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: SCNAppBar(
+        title: title,
+      ),
+      body: child,
+    );
+  }
+}