added example

README.md

@@ -23,7 +23,7 @@ reg.lookup('my-service-name', function(err, service) {
 
 ```
 
-Running the above example will produce the following output
+Running the above [example](https://github.com/mafintosh/etcd-registry/blob/master/example.js) will produce the following output
 
 ```
 Found the following service:

example.js

@@ -0,0 +1,16 @@
+var registry = require('./');
+
+var client = registry('127.0.0.1:4001,127.0.0.1:4002,127.0.0.1:4003');
+
+client.join('test', {
+	port:8080,
+	inserted:Date.now()
+}, function() {
+	setTimeout(function() {
+		client.lookup('test', function(err, service) {
+			console.log('error:', err);
+			console.log('service:', service);
+			client.leave();
+		});
+	}, 100);
+});