Added donation in contributing section

README.md

@@ -1405,6 +1405,7 @@ It will also explain how to create KeyStores, Certificates, Certificate Signing
 There are plenty of ways to contribute to this project:
 
 * Give it a star
+* Make a donation through [GitHub](https://github.com/sponsors/Hakky54) or [open collective](https://opencollective.com/hakky54)
 * Share it with a [![Tweet](https://img.shields.io/twitter/url/http/shields.io.svg?style=social)](https://twitter.com/intent/tweet?text=Easily%20configure%20ssl/tls%20for%20your%20favourite%20http%20client%20with%20sslcontext-kickstart.%20Works%20with%20over%2040%20different%20java,%20scala,%20kotlin%20clients&url=https://github.com/Hakky54/sslcontext-kickstart&via=hakky541&hashtags=encryption,security,https,ssl,tls,developer,java,scala,kotlin,sslcontextkickstart)
 * Join the [Gitter room](https://gitter.im/hakky54/sslcontext-kickstart) and leave a feedback or help with answering users questions
 * Submit a PR