Added some basic documentation

docs/docker/nginx-proxy with proxy authentication/README.md

@@ -0,0 +1,15 @@
+This is a further example combining the power of nginx with the reverse proxy authentication service, [Authelia](https://github.com/authelia/authelia).
+
+Please refer to the appropriate documentation on how to setup the reverse proxy, authentication, and networks.
+
+Ensure users have been configured for Authelia, and that the endpoint that recipes is pointed to is protected, but available.
+
+There is a good guide to the other additional files that need to be added to your Nginx set up at the [Authelia Docs](https://docs.authelia.com/deployment/supported-proxies/nginx.html).
+
+Remember to add the appropriate environment variables to `.env` file:
+```
+VIRTUAL_HOST=
+LETSENCRYPT_HOST=
+LETSENCRYPT_EMAIL=
+PROXY_HEADER=
+```