Added timetable custom event dialog

lib/view/pages/timetable/timetable.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 
 import 'package:flutter/material.dart';
 import 'package:marianum_mobile/extensions/dateTime.dart';
+import 'package:marianum_mobile/view/pages/timetable/addCustomTimetableEventDialog.dart';
 import 'package:provider/provider.dart';
 import 'package:syncfusion_flutter_calendar/calendar.dart';
 
@@ -64,6 +65,12 @@ class _TimetableState extends State<Timetable> {
                 controller.displayDate = DateTime.now().add(const Duration(days: 2));
               }
           ),
+          IconButton(
+            icon: const Icon(Icons.add_card_outlined),
+            onPressed: () {
+              showDialog(context: context, builder: (context) => const AddCustomTimetableEventDialog());
+            },
+          ),
         ],
       ),
       body: Consumer<TimetableProps>(