new_contents: from app import app
  
  
  @app.route('/user/list/:id', methods=['GET'])
  def get_articles_from_list(list_id):
      """
      @api {get} /user/list/:id Get articles of a list
      @apiName Get articles of a list
      @apiGroup List
  
      @apiHeader {String} Access-Token Access token obtains from Oauth2 provider.
      @apiHeader {String} Provider-Name Oauth2 provider name.
      @apiHeaderExample {json} Header (Example):
          {
              "Access-Token": "12xsdklajlkadsf",
              "Provider-Name": "Google"
          }
  
      @apiParam {String} id List unique ID.
  
      @apiSuccess {String} List id.
      @apiSuccess {String} List name.
      @apiSuccess {Object[]} articles Articles data.
      @apiSuccess {String} articles.id Article id.
      @apiSuccess {String} article.title Article title.
      @apiSuccessExample {json} Response (Example):
          {
              "id": "31ladsjfl",
              "name": "CMPUT 391 Seminar",
              "articles": [{
                  "id": "adlfajdls",
                  "title": "Process"
              }]
          }
      """
      pass
  
subject: add route controller for ‘list’ endpoint