README: extend Usage chapter

README.md

@@ -17,6 +17,8 @@ You are free to implement your unique diff controls.
 
 `npm install image-diff-view`
 
+Checkout [example](https://github.com/a-x-/image-diff-view/blob/master/example/index.html) and [demo](https://github.com/a-x-/a-x-.github.io/blob/master/image-diff-view/index.html).
+
 ```js
 import ImageDiff from 'image-diff-view';
 
@@ -29,6 +31,14 @@ imageDiff.update(beforeUrl, afterUrl, 'fade');
 imageDiff.fade(0.8);
 imageDiff.tune(0.4); // abstract tune method rather than fade/swipe()
 ```
+```html
+<div class='image-diff' id='image-diff'>
+  <div class='image-diff__inner'>
+    <div class='image-diff__before'><img/></div>
+    <div class='image-diff__wrapper'><div class='image-diff__after'><img/></div></div>
+  </div>
+</div>
+```
 
 ## Dependencies
 No dependencies required