title: URL scheme to open Watch app for pairing Apple Watch
body: <p>Is there any URL scheme, so I can open "Watch" app on button click, to pair Apple watch ? like:</p>
  
  <pre><code>UIApplication.sharedApplication().openURL(NSURL(string : /* Watch URL Scheme? */)
  </code></pre>
  
  <p>Or is there any other way to open the "Watch" app on a button click?</p>