code: def create(self, source, destination, gateway_ip, comment=None):
          
          self.items.append(dict(
              source=source, destination=destination,
              gateway_ip=gateway_ip, comment=comment))
docs: Add a new policy route to the engine.
          
          :param str source: network address with /cidr
          :param str destination: network address with /cidr
          :param str gateway: IP address, must be on source network
          :param str comment: optional comment