code: def create_plan(self, posted_plan, project):
          
          route_values = {}
          if project is not None:
              route_values['project'] = self._serialize.url('project', project, 'str')
          content = self._serialize.body(posted_plan, 'CreatePlan')
          response = self._send(http_method='POST',
                                location_id='0b42cb47-cd73-4810-ac90-19c9ba147453',
                                version='5.0',
                                route_values=route_values,
                                content=content)
          return self._deserialize('Plan', response)
docs: CreatePlan.
          Add a new plan for the team
          :param :class:`<CreatePlan> <azure.devops.v5_0.work.models.CreatePlan>` posted_plan: Plan definition
          :param str project: Project ID or project name
          :rtype: :class:`<Plan> <azure.devops.v5_0.work.models.Plan>`