Update README.md

README.md

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 # smartos-k8s
 
-Zone definitions for deploying kubernetes on SmartOS. 1 Master node and 3 workers.
+Zone definitions for deploying kubernetes on SmartOS. 1 Master node and 3 workers.  
+
+To use:
+* Update the zone definitions to reflect your network setup. 
+* Set root_authorized_keys to your ssh public key.