Implement Webuntis HTTP Api and Display

lib/data/dataHolder.dart

@@ -0,0 +1,11 @@
+import 'package:flutter/cupertino.dart';
+import 'package:localstore/localstore.dart';
+
+abstract class DataHolder extends ChangeNotifier {
+
+  CollectionRef storage(String path) {
+    return Localstore.instance.collection(path);
+  }
+
+  Future<void> run();
+}