title: Git create branch where detached HEAD is
body: <p>I tried something like this:</p>
  
  <pre><code>git branch temp
  </code></pre>
  
  <p>to create a new branch but <em>don't</em> move the <code>HEAD</code>. But I get:</p>
  
  <pre><code># Not currently on any branch.
  </code></pre>
  
  <p>I don't want to merge anything, I just want a new branch at the current <code>HEAD</code>.</p>