title: adding text to image within image picker
body: <p>hello i am creating an <code>iOS</code> app using <code>cocoa</code> and <code>xcode</code></p>
  
  <p>i am very new to the whole thing and have gotten kind of lost. 
  in part of my application the user must choose a picture from the library or using a camera, then some text is added to it(just like "id cap that"). 
  the question is where would i add the text and how do i save it to the phone? </p>
  
  <p>i know there is a <code>allowsImageEditing</code> property, the question is how to i edit it so that instead of crop and zoom it will add text and have an option of saving.</p>
  
  <p>thank you</p>