code: public GitlabBadge addGroupBadge(Integer groupId, String linkUrl, String imageUrl) throws IOException {
          String tailUrl = GitlabGroup.URL + "/" + groupId + GitlabBadge.URL;
          return dispatch().with("link_url", linkUrl)
                  .with("image_url", imageUrl)
                  .to(tailUrl, GitlabBadge.class);
      }
docs: Add group badge
  
  @param groupId  The id of the group for which the badge should be added
  @param linkUrl  The URL that the badge should link to
  @param imageUrl The URL to the badge image
  @return The created badge
  
  @throws IOException on GitLab API call error