title: Create click-through overlay instruction view
body: <p>A really simple question here.
  How do you create a view like this? 
  <img src="https://i.stack.imgur.com/EIdlU.png" alt="enter image description here"></p>
  
  <p>It has to overlay the first time user runs this part of the app and be removed forever once the user taps on it. I understand it should be a UIImageView, but how do you make it active and then remove it from the view forever?</p>