Update index.md

Author: egil

docs/site/index.md

@@ -75,3 +75,8 @@ Shout outs and a big thank you [to all the contributors](https://github.com/egil
 - Help build the library. Just pick an issue and submit pull-requests.
 - Help write documentation.
 - Create blog posts, presentations or video tutorials. If you do, I'll be happy to showcase them in the [related section](xref:external-resources) on this site.
+
+## Code of conduct
+
+## Code of conduct
+This project is part of the .NET Foundation and adheres to its code of conduct. You can read about it here: https://dotnetfoundation.org/about/code-of-conduct