add mkdocs reference

README.md

@@ -15,3 +15,7 @@ pip install -r  ./requirements/docs.txt
 ## Files hierarchy
 
 When adding new pages, add it respectively to the [mkdocs.yml](https://forge.grandlyon.com/web-et-numerique/factory/llle_project/self-data-technical-doc/-/blob/master/mkdocs.yml#L46)
+
+## Mkdocs Reference
+
+[mkdocs features](https://squidfunk.github.io/mkdocs-material/reference/)