code: def register(self, user_dict):
          
          endpoint = os.path.join(self._config.get('napps', 'api'), 'users', '')
          res = self.make_request(endpoint, method='POST', json=user_dict)
  
          return res.content.decode('utf-8')
docs: Send an user_dict to NApps server using POST request.
  
          Args:
              user_dict(dict): Dictionary with user attributes.
  
          Returns:
              result(string): Return the response of Napps server.