code: def addUser(self, invitationList,
                  subject, html):
          
          url = self._url + "/invite"
          params = {"f" : "json"}
          if isinstance(invitationList, parameters.InvitationList):
              params['invitationList'] = invitationList.value()
          params['html'] = html
          params['subject'] = subject
          return self._post(url=url,
                               param_dict=params,
                               securityHandler=self._securityHandler,
                               proxy_url=self._proxy_url,
                               proxy_port=self._proxy_port)
docs: adds a user without sending an invitation email
  
          Inputs:
             invitationList - InvitationList class used to add users without
              sending an email
             subject - email subject
             html - email message sent to users in invitation list object