Add some //TODO items

lib/widget/dialogs.dart

@@ -3,6 +3,12 @@ import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:font_awesome_flutter/font_awesome_flutter.dart';
 
+void showMessage(BuildContext context, String message) {
+  Scaffold.of(context).showSnackBar(SnackBar(
+    content: Text(message),
+  ));
+}
+
 void showErrorDialog(BuildContext context, String title, String description) {
   showDialog(
     context: context,