add button donate in README.md

Author: artemsheludko

README.md

@@ -27,6 +27,12 @@ The post page would look like this:
 
 Fork the ``master`` branch and delete ``gh-pages`` branch in it. This is important because ``gh-pages`` branch is used here only to host the blog. You should be using the master branch as the source and create a fresh ``gh-pages`` branch.
 
-### License
+## License
 
 GNU General Public License v3.0
+
+## Donate
+
+<p>If you want to show your appreciation, buy me one <a href="https://www.buymeacoffee.com/artemsheludko" target="_blank"><img style="vertical-align: middle;" src="https://www.buymeacoffee.com/assets/img/custom_images/orange_img.png" alt="Buy Me A Coffee" style="height: auto !important;width: auto !important;" ></a> ! Every five cups of coffee and a new theme for Jekyll is ready 😋</p>
+<p>Either way, your support is a way to thank me ❤️</p>
+<p align="center"><b>Thank you for your support!</b></p>