Added option to add reactions to talk messages

lib/api/marianumcloud/talk/reactMessage/reactMessage.dart

@@ -0,0 +1,26 @@
+import 'package:http/http.dart' as http;
+import 'package:http/http.dart';
+
+import '../../../apiParams.dart';
+import '../talkApi.dart';
+import 'reactMessageParams.dart';
+
+class ReactMessage extends TalkApi {
+  String chatToken;
+  int messageId;
+  ReactMessage({required this.chatToken, required this.messageId, required ReactMessageParams params}) : super("v1/reaction/$chatToken/$messageId", params);
+
+  @override
+  assemble(String raw) {
+
+  }
+
+  @override
+  Future<Response>? request(Uri uri, ApiParams? body, Map<String, String>? headers) {
+    if(body is ReactMessageParams) {
+      return http.post(uri, headers: headers, body: body.toJson());
+    }
+    return null;
+  }
+
+}