readme add lists
nginx acting as proxy and cache server for eXist

- development NGINX config

- [x]  symbolic link to NGINX exec in /usr/local/bin
- [x]  logging and cache and proxy directories established
- [x]  copy over NGNIX  common and dev config files
- [x]  stop NGINX, test config, if OK start NGINX

http://asciinema.org/a/14781

issue: feature #11 nginx acting as proxy server for eXist