title: Display settings window only once
body: <p>I would like to open a settings window only once, first time i open my app.
  After that, this settings window will doesn't display anymore and it will display the main view of the app.</p>
  
  <p>I don't know how can i solve this problem, because the Storyboard only has one initial ViewController, and i would need two (a ViewController with settings, and other ViewController with my main view).</p>
  
  <p>How can i choose between my both ViewController?</p>
  
  <p>Thanks.</p>