Update README.md

Signed-off-by: Lee Calcote <[email protected]>

Author: leecalcote

README.md

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 A workshop on advanced aspects of service mesh through the lens of Istio. Questions? Join the [service mesh community](http://slack.layer5.io).
 
+[Free] Use the Cloud Native Playground to walk-through the labs in this workshop in a live Kubernetes environment - https://play.meshery.io
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 ## Prerequisites
 
 - [Prereqs - Setup Docker, Kubernetes, and Meshery](prereq/README.md)