Update README.md

Micro-Bus-Service · Nov 21, 2019 · 7016095 · 7016095
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@@ -13,4 +13,6 @@ MBS (Micro Bus Service) is a bus for microservice's architecture write in Typesc
 The documentation of this project is on [read the docs](https://mbs.readthedocs.io)
 
 ## Contributing
-[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
+[![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com)
+
+**Working on your first Pull Request?** You can learn how from this *free* series [How to Contribute to an Open Source Project on GitHub](https://egghead.io/series/how-to-contribute-to-an-open-source-project-on-github)