code: public BoxRequestsBookmark.CreateBookmark getCreateRequest(String parentId, String url) {
          BoxRequestsBookmark.CreateBookmark request = new BoxRequestsBookmark.CreateBookmark(parentId, url, getBookmarksUrl(), mSession);
          return request;
      }
docs: Gets a request that creates a bookmark in a parent bookmark
  
  @param parentId  id of the parent bookmark to create the bookmark in
  @param url      URL of the new bookmark
  @return      request to create a bookmark