Add simple README

Author: erijo

README.md

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+Transparent HTTP proxy
+======================
+
+A basic transparent HTTP proxy that can sit between a client and HTTP servers,
+proxying requests from the client and rewriting the returned resource.
+
+Much inspiration taken from
+[sergio-proxy](https://code.google.com/p/sergio-proxy/).
+
+It is enabled on the gateway (in my case for a single client) by a simple
+iptables rule:
+
+    iptables -t nat -A PREROUTING -s $CLIENT_IP -p tcp --dport 80 -j REDIRECT --to-port 8080