Added Nextcloud base

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

@@ -0,0 +1,26 @@
+import 'dart:convert';
+
+import 'package:http/http.dart' as http;
+import 'package:http/src/response.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/chat/getChatResponse.dart';
+import 'package:marianum_mobile/api/marianumcloud/talk/talkApi.dart';
+
+import 'getChatParams.dart';
+
+class GetChat extends TalkApi<GetChatResponse> {
+  String chatToken;
+
+  GetChatParams params;
+  GetChat(this.chatToken, this.params) : super("v1/chat/$chatToken", null, getParameters: params.toJson());
+
+  @override
+  assemble(String raw) {
+    return GetChatResponse.fromJson(jsonDecode(raw)['ocs']); // TODO move "ocs" to superclass
+  }
+
+  @override
+  Future<Response> request(Uri uri, Object? body, Map<String, String>? headers) {
+    return http.get(uri, headers: headers);
+  }
+  
+}