Added api for custom timetable events

lib/api/mhsl/customTimetableEvent/customTimetableEvent.dart

@@ -0,0 +1,28 @@
+import 'package:json_annotation/json_annotation.dart';
+
+import '../mhslApi.dart';
+
+part 'customTimetableEvent.g.dart';
+
+@JsonSerializable()
+class CustomTimetableEvent {
+  String id;
+  String title;
+  String description;
+  @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
+  DateTime startDate;
+  @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
+  DateTime endDate;
+  String rrule;
+  @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
+  DateTime createdAt;
+  @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
+  DateTime updatedAt;
+
+  CustomTimetableEvent({required this.id, required this.title, required this.description, required this.startDate,
+    required this.endDate, required this.rrule, required this.createdAt, required this.updatedAt});
+
+
+  factory CustomTimetableEvent.fromJson(Map<String, dynamic> json) => _$CustomTimetableEventFromJson(json);
+  Map<String, dynamic> toJson() => _$CustomTimetableEventToJson(this);
+}