add website link to readme

Author: lkeegan

README.md

@@ -3,3 +3,5 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![docs](https://github.com/ssciwr/QHCC/actions/workflows/docs.yml/badge.svg)](https://github.com/ssciwr/QHCC/actions/workflows/docs.yml)
 [![notebooks](https://github.com/ssciwr/QHCC/actions/workflows/notebooks.yml/badge.svg)](https://github.com/ssciwr/QHCC/actions/workflows/notebooks.yml)
+
+Source code and example notebooks for the [Q-HCC website](ssciwr.github.io/QHCC).