docs: public Group create(String name) {
          String url = WxEndpoint.get("url.group.create");
          String json = String.format("{\"group\":{\"name\":\"%s\"}}", name);
          logger.debug("create group: {}", json);
          String response = wxClient.post(url, json);
  
          return JsonMapper.defaultUnwrapRootMapper().fromJson(response, Group.class);
      }