Update README.md

Author: lmammino

README.md

@@ -28,4 +28,15 @@ Run the build with:
 
 ```bash
 npm run build
-```
+```
+
+## Support this book
+
+A book is a work of art and passion. We invested a lot of our time and tried our best to create a great book and we hope we managed to give you something valuable with our efforts. If you enjoyed this book, here are some ways you can help us to spread the word and support our work:
+
+  - Leave a review on [Amazon.com](https://www.amazon.com/gp/product/1839214112) (or other Amazon stores), on [Packt.com](https://www.packtpub.com/product/node-js-design-patterns-third-edition/9781839214110) or on [GoodReads](https://www.goodreads.com/book/show/54518801-node-js-design-patterns---third-edition).
+  - Share the book's website on Social media ([Share on Twitter](https://twitter.com/intent/tweet?text=Check%20out%20Node.js%20Design%20Patterns%20if%20you%20want%20to%20take%20your%20%23Nodejs%20knowledge%20to%20the%20next%20level%3A%20&url=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2F), [Share on Facebook](https://www.facebook.com/sharer/sharer.php?u=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2F), [Share on Pinterest](http://pinterest.com/pin/create/button/?url=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2F&media=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2Fimg%2Fnode-js-design-patterns.jpg&description=Check%20out%20Node.js%20Design%20Patterns%20if%20you%20want%20to%20take%20your%20%23Nodejs%20knowledge%20to%20the%20next%20level%3A%20), [Share on LinkedIn](http://www.linkedin.com/shareArticle?mini=true&url=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2F&title=Check%20out%20Node.js%20Design%20Patterns%20if%20you%20want%20to%20take%20your%20%23Nodejs%20knowledge%20to%20the%20next%20level%3A%20), [Share on Tumblr](http://www.tumblr.com/share?v=3&u=https%3A%2F%2Fwww.nodejsdesignpatterns.com%2F&t=Check%20out%20Node.js%20Design%20Patterns%20if%20you%20want%20to%20take%20your%20%23Nodejs%20knowledge%20to%20the%20next%20level%3A%20))
+  - Check out and follow this project on [Product Hunt](https://www.producthunt.com/posts/node-js-design-patterns-third-edition) and [Indie Hackers](https://www.indiehackers.com/product/node-js-design-patterns)
+  - Follow the authors on Twitter: [Mario Casciaro](https://twitter.com/mariocasciaro), [Luciano Mammino](https://twitter.com/loige)
+  
+THANK YOU ❤️