readme: Add buy me a coffee badge.

README.md

@@ -2,6 +2,8 @@
 
 [![Awesome](https://cdn.rawgit.com/sindresorhus/awesome/d7305f38d29fed78fa85652e3a63e154dd8e8829/media/badge.svg)](https://github.com/sindresorhus/awesome) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![Join the chat at https://gitter.im/hackerkid/bots](https://badges.gitter.im/hackerkid/bots.svg)](https://gitter.im/hackerkid/Mind-Expanding-Books?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
 
+<a href="https://www.buymeacoffee.com/hackerkid" target="_blank"><img src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: 41px !important;width: 174px !important;box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;-webkit-box-shadow: 0px 3px 2px 0px rgba(190, 190, 190, 0.5) !important;" ></a>
+
 > Curated list of mind expanding books.
 
 ## Table of Contents