code: def create(cls, name, certificate):
          
          json = {'name': name,
                  'certificate': certificate}
          
          return ElementCreator(cls, json)
docs: Create a new external VPN CA for signing internal gateway
          certificates.
          
          :param str name: Name of VPN CA
          :param str certificate: file name, path or certificate string.
          :raises CreateElementFailed: Failed creating cert with reason
          :rtype: VPNCertificateCA