code: public Pager<TreeItem> getTree(Object projectIdOrPath, int itemsPerPage) throws GitLabApiException {
          return (getTree(projectIdOrPath, "/", "master", false, itemsPerPage));
      }
docs: Get a Pager of repository files and directories in a project.
  
  <pre><code>GitLab Endpoint: GET /projects/:id/repository/tree</code></pre>
  
  @param projectIdOrPath the project in the form of an Integer(ID), String(path), or Project instance
  @param itemsPerPage the number of Project instances that will be fetched per page
  @return a Pager containing a tree with the root directories and files of a project
  @throws GitLabApiException if any exception occurs