#8 Added marker to indicate read status in talk chats

lib/api/marianumcloud/talk/getParticipants/getParticipantsResponse.dart

@@ -1,10 +1,11 @@
 
 import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/apiResponse.dart';
 
 part 'getParticipantsResponse.g.dart';
 
 @JsonSerializable(explicitToJson: true)
-class GetParticipantsResponse {
+class GetParticipantsResponse extends ApiResponse {
   Set<GetParticipantsResponseObject> data;
 
   GetParticipantsResponse(this.data);

lib/api/marianumcloud/talk/getParticipants/getParticipantsResponse.g.dart

@@ -13,13 +13,24 @@ GetParticipantsResponse _$GetParticipantsResponseFromJson(
           .map((e) =>
               GetParticipantsResponseObject.fromJson(e as Map<String, dynamic>))
           .toSet(),
-    );
+    )..headers = (json['headers'] as Map<String, dynamic>?)?.map(
+        (k, e) => MapEntry(k, e as String),
+      );
 
 Map<String, dynamic> _$GetParticipantsResponseToJson(
-        GetParticipantsResponse instance) =>
-    <String, dynamic>{
-      'data': instance.data.map((e) => e.toJson()).toList(),
-    };
+    GetParticipantsResponse instance) {
+  final val = <String, dynamic>{};
+
+  void writeNotNull(String key, dynamic value) {
+    if (value != null) {
+      val[key] = value;
+    }
+  }
+
+  writeNotNull('headers', instance.headers);
+  val['data'] = instance.data.map((e) => e.toJson()).toList();
+  return val;
+}
 
 GetParticipantsResponseObject _$GetParticipantsResponseObjectFromJson(
         Map<String, dynamic> json) =>