Added imprint and privacy information for marianum and webuntis

lib/widget/quickMenu.dart

@@ -0,0 +1,23 @@
+import 'package:flutter/material.dart';
+
+class QuickMenu {
+  static void quickMenu(BuildContext context, BuildContext widgetContext, List<PopupMenuItem<dynamic>> items) {
+    final RenderBox overlay = Overlay.of(context).context.findRenderObject() as RenderBox;
+
+    final RenderBox widgetRenderBox = widgetContext.findRenderObject() as RenderBox;
+    final Offset position = widgetRenderBox.localToGlobal(Offset.zero);
+
+    showMenu(
+      context: context,
+      position: RelativeRect.fromRect(
+        Rect.fromPoints(
+          position,
+          position.translate(0, 0),
+        ),
+        Offset.zero & overlay.size,
+      ),
+      items: items,
+    );
+  }
+
+}