Clarify and enforce cluster name format in Helm values (#112)

Author: paliwalparitosh

README.md

@@ -196,6 +196,7 @@ Create OCI Logging Analytics LogGroup(s) if not done already. Refer [Create Log
       # -- OCID for OKE cluster or a unique ID for other Kubernetes clusters.
       kubernetesClusterID:
       # -- Provide a unique name for the cluster. This would help in uniquely identifying the logs and metrics data at OCI Logging Analytics and OCI Monitoring respectively.
+      # -- Must follow the format '<Cluster_Name>_<Cluster_Creation_Time>' instead of just the cluster name.
       kubernetesClusterName:
 
     oci-onm-logan: