Update README.md

Signed-off-by: Lee Calcote <lee.calcote@layer5.io>

Author: leecalcote

Diff for: README.md

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 # Introduction to Istio
 A workshop teaching concepts of service mesh through the lens of Istio. Questions? See the community [discussion forum](http://discuss.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
+
 ## Prerequisites
 
 - [Prereq - Setup Docker, Kubernetes, and Meshery](prereq/README.md)