ib group member add

def ib_group_member_add(self, group_id, userids):
        ''' ib group member add '''
        req_hook = 'pod/v1/admin/group/' + group_id + '/membership/add'
        req_args = {'usersListId': userids}
        req_args = json.dumps(req_args)
        status_code, response = self.__rest__.POST_query(req_hook, req_args)
        self.logger.debug('%s: %s' % (status_code, response))
        return status_code, response