option to change custom timetable event colors

lib/api/mhsl/customTimetableEvent/customTimetableEvent.dart

@@ -13,6 +13,7 @@ class CustomTimetableEvent {
   DateTime startDate;
   @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
   DateTime endDate;
+  String? color;
   String rrule;
   @JsonKey(toJson: MhslApi.dateTimeToJson, fromJson: MhslApi.dateTimeFromJson)
   DateTime createdAt;
@@ -20,7 +21,7 @@ class CustomTimetableEvent {
   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});
+    required this.endDate, required this.color, required this.rrule, required this.createdAt, required this.updatedAt});
 
   factory CustomTimetableEvent.fromJson(Map<String, dynamic> json) => _$CustomTimetableEventFromJson(json);
   Map<String, dynamic> toJson() => _$CustomTimetableEventToJson(this);

lib/api/mhsl/customTimetableEvent/customTimetableEvent.g.dart

@@ -14,6 +14,7 @@ CustomTimetableEvent _$CustomTimetableEventFromJson(
       description: json['description'] as String,
       startDate: MhslApi.dateTimeFromJson(json['startDate'] as String),
       endDate: MhslApi.dateTimeFromJson(json['endDate'] as String),
+      color: json['color'] as String?,
       rrule: json['rrule'] as String,
       createdAt: MhslApi.dateTimeFromJson(json['createdAt'] as String),
       updatedAt: MhslApi.dateTimeFromJson(json['updatedAt'] as String),
@@ -27,6 +28,7 @@ Map<String, dynamic> _$CustomTimetableEventToJson(
       'description': instance.description,
       'startDate': MhslApi.dateTimeToJson(instance.startDate),
       'endDate': MhslApi.dateTimeToJson(instance.endDate),
+      'color': instance.color,
       'rrule': instance.rrule,
       'createdAt': MhslApi.dateTimeToJson(instance.createdAt),
       'updatedAt': MhslApi.dateTimeToJson(instance.updatedAt),