public GitlabGroupMember addGroupMember(GitlabGroup group,GitlabUser user,GitlabAccessLevel accessLevel) throws IOException {
  return addGroupMember(group.getId(),user.getId(),accessLevel);
}

public GitlabGroupMember addGroupMember ( GitlabGroup group , GitlabUser user , GitlabAccessLevel accessLevel ) throws IOException { return addGroupMember ( group . getId ( ) , user . getId ( ) , accessLevel ) ; }
add a group member .
