added title

lib/pages/task_overview_page.dart

@@ -22,7 +22,7 @@ class _TaskOverviewPageState extends State<TaskOverviewPage> {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(),
+      appBar: AppBar(title: Text('Hallo Yannick')),
       body: Padding(
         padding: EdgeInsetsGeometry.symmetric(
           horizontal: MediaQuery.of(context).size.width * 0.05,