code: public StatusCode addItemToList(String sessionId, String listId, Integer mediaId) throws MovieDbException {
          return tmdbList.addItem(sessionId, listId, mediaId);
      }
docs: This method lets users add new items to a list that they created.
  
  A valid session id is required.
  
  @param sessionId sessionId
  @param listId listId
  @param mediaId mediaId
  @return true if the movie is on the list
  @throws MovieDbException exception