Added holidays viewer

lib/main.dart

@@ -12,6 +12,7 @@ import 'model/accountModel.dart';
 import 'model/chatList/chatListProps.dart';
 import 'model/chatList/chatProps.dart';
 import 'model/files/filesProps.dart';
+import 'model/holidays/holidaysProps.dart';
 import 'model/message/messageProps.dart';
 import 'model/timetable/timetableProps.dart';
 import 'storage/base/settingsProvider.dart';
@@ -42,6 +43,7 @@ Future<void> main() async {
           ChangeNotifierProvider(create: (context) => FilesProps()),
 
           ChangeNotifierProvider(create: (context) => MessageProps()),
+          ChangeNotifierProvider(create: (context) => HolidaysProps()),
         ],
         child: const Main(),
       )