Merge pull request #7 from vielmetti/patch-1

README updates

README.md

@@ -2,4 +2,23 @@ ndp [![Build Status](https://travis-ci.org/mdlayher/ndp.svg?branch=master)](http
 ===
 
 Package `ndp` implements the Neighbor Discovery Protocol, as described in
-[RFC 4861](https://tools.ietf.org/html/rfc4861).  MIT Licensed.
+[RFC 4861](https://tools.ietf.org/html/rfc4861).  MIT Licensed.
+
+The command `ndp` is a utility for working with the Neighbor Discovery Protocol.
+
+## Examples
+
+Listen for incoming NDP messages on interface eth0 to one of the interface's
+global unicast addresses.
+
+```
+$ sudo ndp -i eth0 -a global listen
+$ sudo ndp -i eth0 -a 2001:db8::1 listen
+````
+
+Send router solicitations on interface eth0 from the interface's link-local
+address until a router advertisement is received.
+
+```
+$ sudo ndp -i eth0 -a linklocal rs
+```