Document k8s pv removal

charts/aws-ebs-csi-driver/README.md

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+## How to delete volumes with `recalimPolicy: retain`
+1. Delete pvc:
+```
+kubectl delete pvc <pvc-name>
+```
+
+2. Verify PV is `released`
+```
+kubectl get pv <pv-name>
+```
+
+3. Manually remove EBS in AWS
+    1. Go to AWS GUI and List EBS Volumes
+    1. Filter by tag `ebs.csi.aws.com/cluster=true`
+    1. Identify the volume associated with your PV (check `kubernetes.io/created-for/pv/name` tag of the EBS Volume)
+    1. Verify that EBS Volume is `Available`
+    1. Delete EBS Volume
+
+4. Delete the PV
+```
+kubectl delete pv <pv-name>
+```
+
+5. Remove Finalizers (if necessary)
+If the PV remains in a Terminating state, remove its finalizers:
+```
+kubectl patch pv <pv-name> -p '{"metadata":{"finalizers":null}}'
+```