Added Nextcloud base

lib/api/marianumcloud/talk/chat/getChatParams.dart

@@ -0,0 +1,33 @@
+import 'package:json_annotation/json_annotation.dart';
+import 'package:marianum_mobile/api/apiParams.dart';
+
+part 'getChatParams.g.dart';
+
+@JsonSerializable(explicitToJson: true, includeIfNull: false)
+class GetChatParams extends ApiParams {
+  GetChatParamsSwitch lookIntoFuture;
+  int? limit;
+  int? lastKnownMessageId;
+  int? lastCommonReadId;
+  int? timeout;
+  GetChatParamsSwitch? setReadMarker;
+  GetChatParamsSwitch? includeLastKnown;
+
+  GetChatParams({
+      required this.lookIntoFuture,
+      this.limit,
+      this.lastKnownMessageId,
+      this.lastCommonReadId,
+      this.timeout,
+      this.setReadMarker,
+      this.includeLastKnown
+  });
+
+  factory GetChatParams.fromJson(Map<String, dynamic> json) => _$GetChatParamsFromJson(json);
+  Map<String, dynamic> toJson() => _$GetChatParamsToJson(this);
+}
+
+enum GetChatParamsSwitch {
+  @JsonValue(1) on,
+  @JsonValue(0) off,
+}