title: Git add single subdirectory recursively
body: <p>I know I can add everything in my working directory with the following syntax:</p>
  
  <pre><code>git add .
  </code></pre>
  
  <p>I also know I can add the contents of a subdirectory with this syntax:</p>
  
  <pre><code>git add subdir/*
  </code></pre>
  
  <p>But how do I add everything (recursively) in a single subdirectory? I imagine it looks something like this:</p>
  
  <pre><code>git add subdir/.
  </code></pre>