code: def add_child_resource_client(self, res_name, res_spec):
          
          res_spec = dict(res_spec)
          res_spec['name'] = res_name
          res = self.client_resource_factory(
                  res_spec, parent=self, logger=self._logger)
          self.children[resource.escape_name(res_name)] = res;
          self._children_dirty = True
          res.set_ioloop(self.ioloop)
          res.start()
          return res
docs: Add a resource client to the container and start the resource connection