code: public CreateTagResponse create(String tagName) {
          BeanUtil.requireNonNull(tagName, "tagName is null");
          CreateTagResponse response;
          LOG.debug("创建标签.....");
          String url = BASE_API_URL + "cgi-bin/tags/create?access_token=#";
          Map<String, Object> param = new HashMap<String, Object>();
          Map<String, Object> tag = new HashMap<String, Object>();
          tag.put("name", tagName);
          param.put("tag", tag);
          BaseResponse r = executePost(url, JSONUtil.toJson(param));
          String resultJson = isSuccess(r.getErrcode()) ? r.getErrmsg() : r.toJsonString();
          response = JSONUtil.toBean(resultJson, CreateTagResponse.class);
          return response;
      }
docs: 创建标签
  @param tagName 标签名称
  @return 创建的标签结果