Added details for chats with participants list

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

@@ -0,0 +1,26 @@
+import 'dart:convert';
+
+import '../../../requestCache.dart';
+import 'getParticipants.dart';
+import 'getParticipantsResponse.dart';
+
+class GetParticipantsCache extends RequestCache<GetParticipantsResponse> {
+  String chatToken;
+
+  GetParticipantsCache({required onUpdate, required this.chatToken}) : super(RequestCache.cacheNothing, onUpdate) {
+    start("MarianumMobile", "nc-chat-participants-$chatToken");
+  }
+
+  @override
+  Future<GetParticipantsResponse> onLoad() {
+    return GetParticipants(
+        chatToken,
+    ).run();
+  }
+
+  @override
+  GetParticipantsResponse onLocalData(String json) {
+    return GetParticipantsResponse.fromJson(jsonDecode(json));
+  }
+
+}