docs: add docs about upgrading the cluster

Signed-off-by: Deepika Upadhyay <[email protected]>

Author: Deepika Upadhyay

kubernetes-cluster-demo/setup-demo.md renamed to kubernetes-cluster-demo/docs/setup-demo.md

@@ -0,0 +1,12 @@
+## How to do an upgrade for your koor storage distribution?
+
+The steps are similar to rook/koor upgrade guide for our demo environment
+
+### Upgrade helm chart
+
+```code
+$ helm upgrade -nkoor-ceph koor-ceph-cluster koor-release/rook-ceph-cluster --set image.tag=v1.x.x (eg. v1.12.0)
+```
+
+For verification and upgrade for other components please refer [here](https://docs.koor.tech/v1.12/Upgrade/health-verification/)
+