Update README.md

README.md

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+# Helm Charts for GeoNetowrk Deployment
  Helm Charts for GeoNetowrk with Harmonized North American Profile (HNAP) plugin 
- Current version for both GeoNetwork and HNAP is v4.2.7
+ <br>The current version for both GeoNetwork and HNAP is v4.2.7
+ <br>Optional sub-charts include postgress-postgis, elasticsearch, kibana, ogc-api-records-service 
+
+## Usage 
+If you are running in your local Kubernetes environment, ensure that you have a persistent volume ready. 
+<br>Double-check the values.yaml file, paying particular attention to the ingress parameters.
+ ````
+helm install -n <your namespace> geonetwork ./geonetwork-4.2.7
+ ````