Added api for custom timetable events

lib/api/mhsl/customTimetableEvent/get/getCustomTimetableEventCache.dart

@@ -0,0 +1,24 @@
+import 'dart:convert';
+
+import '../../../requestCache.dart';
+import 'getCustomTimetableEvent.dart';
+import 'getCustomTimetableEventParams.dart';
+import 'getCustomTimetableEventResponse.dart';
+
+class GetCustomTimetableEventCache extends RequestCache<GetCustomTimetableEventResponse> {
+  GetCustomTimetableEventParams params;
+
+  GetCustomTimetableEventCache(this.params, {onUpdate, renew}) : super(RequestCache.cacheMinute, onUpdate, renew: renew) {
+    start("MarianumMobile", "customTimetableEvents");
+  }
+
+  @override
+  Future<GetCustomTimetableEventResponse> onLoad() {
+    return GetCustomTimetableEvent(params).run();
+  }
+
+  @override
+  GetCustomTimetableEventResponse onLocalData(String json) {
+    return GetCustomTimetableEventResponse.fromJson(jsonDecode(json));
+  }
+}