Added holidays viewer

lib/model/holidays/holidaysProps.dart

@@ -0,0 +1,26 @@
+
+import '../../api/apiResponse.dart';
+import '../../api/holidays/getHolidaysCache.dart';
+import '../../api/holidays/getHolidaysResponse.dart';
+import '../dataHolder.dart';
+
+
+class HolidaysProps extends DataHolder {
+  GetHolidaysResponse? _getHolidaysResponse;
+  GetHolidaysResponse get getHolidaysResponse => _getHolidaysResponse!;
+
+  @override
+  List<ApiResponse?> properties() {
+    return [_getHolidaysResponse];
+  }
+
+  @override
+  void run() {
+    GetHolidaysCache(
+      onUpdate: (GetHolidaysResponse data) => {
+        _getHolidaysResponse = data,
+        notifyListeners(),
+      },
+    );
+  }
+}