title: How to use fetch command in jGit?
body: <p>This is my code for add remote.</p>
  
  <pre><code>  FileRepositoryBuilder builder = new FileRepositoryBuilder();
              Repository repository = builder.setGitDir(gitdir)
                      .readEnvironment() // scan environment GIT_* variables
                      .findGitDir() // scan up the file system tree
                      .build();
              Git git = new Git(repository);
  
              StoredConfig config = git.getRepository().getConfig();
              config.setString("remote", "origin", "url", url);
              config.save();
  </code></pre>
  
  <p>Now how to use fetch command using jGit? </p>