examples improvement - added some README.md stubs

examples/reverse-proxy-multisite/README.md

@@ -0,0 +1,11 @@
+# Reverse proxy multisite
+
+Simple example to show how to setup bunkerized-nginx in front of some existing HTTP services. Each service has its own domain hence the multisite.
+
+## Architecture
+
+<img src="https://github.com/bunkerity/bunkerized-nginx/blob/dev/examples/reverse-proxy-multisite/architecture.png?raw=true" />
+
+## Docker
+
+See [docker-compose.yml](https://github.com/bunkerity/bunkerized-nginx/blob/master/examples/reverse-proxy-multisite/docker-compose.yml).