title: Maintain aspect ratio of image with full width in React Native
body: <p>I have a query regarding  tag. I want an image to take entire width of parent which I do using alignSelf:stretch, but I also want the height to be according to the aspect ratio of the image. How can I achieve something like this?</p>
  
  <p>So I want a way to specify the height as a ratio of the width of the Image.</p>