Added api for custom timetable events

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

@@ -0,0 +1,23 @@
+import 'dart:convert';
+
+import 'package:http/http.dart';
+import 'package:http/http.dart' as http;
+
+import '../../mhslApi.dart';
+import 'getCustomTimetableEventParams.dart';
+import 'getCustomTimetableEventResponse.dart';
+
+class GetCustomTimetableEvent extends MhslApi<GetCustomTimetableEventResponse> {
+  GetCustomTimetableEventParams params;
+  GetCustomTimetableEvent(this.params) : super("server/timetable/customEvents?user=${params.user}");
+
+  @override
+  GetCustomTimetableEventResponse assemble(String raw) {
+    return GetCustomTimetableEventResponse.fromJson({"events": jsonDecode(raw)});
+  }
+
+  @override
+  Future<Response>? request(Uri uri) {
+    return http.get(uri);
+  }
+}