title: Share an image from my website on Whatsapp
body: <p>My website is used mainly from mobiles and I want to allow my users to click a "Share on Whatsapp" button which will open Whatsapp on their device with an image ready to be sent. 
  I know how to share text, as explained <a href="https://stackoverflow.com/questions/21935149/sharing-link-on-whatsapp-from-mobile-website-not-application-for-android">here</a>, but I haven't found anything about image sharing. </p>