docs(README.md): add build badge

Author: Vaughn Dice

README.md

@@ -1,4 +1,6 @@
 # Deis NSQ
+[![Build Status](https://ci.deis.io/job/nsq/badge/icon)](https://ci.deis.io/job/nsq)
+
 Deis (pronounced DAY-iss) Workflow is an open source Platform as a Service (PaaS) that adds a developer-friendly layer to any [Kubernetes](http://kubernetes.io) cluster, making it easy to deploy and manage applications on your own servers.
 
 ![Deis Graphic](https://s3-us-west-2.amazonaws.com/get-deis/deis-graphic-small.png)