title: Create directory in app group container swift
body: <p>How can I go about creating a directory in my App's group container?</p>
  
  <p>I've tried using as the file manager:</p>
  
  <pre><code>let directory: NSURL = NSFileManager.defaultManager().containerURLForSecurityApplicationGroupIdentifier("APP_GROUP_IDENTIFIER")!
  </code></pre>
  
  <p>but that doesn't create a directory...How can I go about creating a directory in this folder?</p>