<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def add_child_resource_client(self, res_name, res_spec):
 """Add a resource client to the container and start the resource connection"""

        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