code: public Response add(String groupId, String subject, String message) throws JinxException {
      JinxUtils.validateParams(groupId, subject, message);
      Map<String, String> params = new TreeMap<>();
      params.put("method", "flickr.groups.discuss.topics.add");
      params.put("group_id", groupId);
      params.put("subject", subject);
      params.put("message", message);
      return jinx.flickrPost(params, Response.class);
    }
docs: Post a new discussion topic to a group.
  <br>
  This method requires authentication with 'write' permission.
  
  @param groupId (Required) The NSID of the group to add a topic to.
  @param subject (Required) The topic subject.
  @param message (Required) The topic message.
  @return object with response from Flickr indicating ok or fail.
  @throws JinxException if required parameters are missing, or if there are any errors.
  @see <a href="https://www.flickr.com/services/api/flickr.groups.discuss.topics.add.html">flickr.groups.discuss.topics.add</a>