Updated readme github buttons

Author: swathii

README.md

@@ -1,4 +1,4 @@
-# Kubernetes Engine Rolling Upgrades
+q# Kubernetes Engine Rolling Upgrades
 
 Kubernetes Engine is a managed service that provides fully automated
 upgrades to keep clusters up to date with the latest Kubernetes versions and
@@ -33,6 +33,16 @@ demos of each.
   * [Relevant Material](#relevant-material)
 <!--te-->
 
+### Run Demo in a Google Cloud Shell
+
+Click the button below to run the demo in a [Google Cloud Shell](https://cloud.google.com/shell/docs/).
+
+[![Open in Cloud Shell](http://gstatic.com/cloudssh/images/open-btn.svg)](https://console.cloud.google.com/cloudshell/open?git_repo=https%3A%2F%2Fgithub.com%2FGoogleCloudPlatform%2Fgke-rolling-updates-demo&page=editor&tutorial=README.md)
+
+All the tools for the demo are installed. When using Cloud Shell execute the following
+command in order to setup gcloud cli. When executing this command please setup your region
+and zone.
+
 ## Versions
 
 A Kubernetes Engine version number represents an immutable collection of