Update README.md

Author: Siddharth Karandikar

README.md

@@ -1,2 +1,26 @@
 # revproxy
-simple reverse proxy
+a simple reverse proxy
+
+it is nothing but go-lang's inbuilt reverse proxy functionality exposed as handy utility.
+
+
+## how to use revproxy
+```
+Usage of $GOROOT/bin/revproxy:
+  -backend string
+        backend's host:port (default "localhost:8080")
+  -crt string
+        certificate file path (default "crt")
+  -https
+        terminate https? (default true)
+  -key string
+        key file path (default "key")
+  -listenOn string
+        port to listen on (default "443")
+```
+#### example
+```
+sudo ~/go/bin/revproxy -backend=demo.io:80 -crt=/tmp/crt -key=/tmp/key
+```
+This will start revproxy process that listens on port 443. It will use certificate and key from location specified in arguments.
+There is a single backend 'demo.io' which is listening on port 80.