Added "How to contribute" section with links.

README.md

@@ -54,6 +54,10 @@ Here are the tutorials to demonstrate the band theory of crystal systems.
 | ------------- |:-------------:| -----:| -----:| -----:|
 | Verlet Integration | Verlet integration | [Verlet Integration](./notebook/molecular-dynamics/verlet_integration.ipynb) | [![Binder](https://mybinder.org/badge_logo.svg)](https://mybinder.org/v2/gh/osscar-org/quantum-mechanics/master?urlpath=%2Fvoila%2Frender%2Fnotebook%2Fmolecular-dynamics%2Fverlet_integration.ipynb) | [![Materials Cloud Tool osscar-qmcourse](https://raw.githubusercontent.com/materialscloud-org/mcloud-badge/main/badges/img/mcloud_badge_tools.svg)](https://osscar-quantum-mechanics.materialscloud.io/voila/render/molecular-dynamics/verlet_integration.ipynb) |
 
+## How to contribute
+
+If you would like to contribute a new notebook to OSSCAR, see the [guide to contributing](https://www.osscar.org/code/contributing.html) on our website, where you can also find an example [notebook template](https://www.osscar.org/code/sample_notebook.html). 
+
 ## Acknowledgements
 
 We acknowledge support from the EPFL Open Science Fund via the [OSSCAR](http://www.osscar.org) project.