doc: update readme

Author: Donaldcwl

README.md

@@ -163,6 +163,11 @@ Typescript definitions are included in the package & referenced in the `types` s
 7. push to your forked repo on github
 8. make a pull request to this repo
 
+## Donation
+If this project help you reduce time to develop, you can give me a cup of coffee :)
+
+<a href="https://www.buymeacoffee.com/donaldcwl" target="_blank"><img src="https://cdn.buymeacoffee.com/buttons/v2/default-red.png" alt="Buy Me A Coffee" height=60 width=217 ></a>
+
 [dist]: https://github.com/Donaldcwl/browser-image-compression/tree/master/dist
 [example]: https://github.com/Donaldcwl/browser-image-compression/tree/master/example
 [delivrjs]: https://cdn.jsdelivr.net/