refactor documentation

Signed-off-by: Bala.FA <[email protected]>

docs/README.md

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+# DirectPV
+DirectPV is a CSI driver to provision local volumes to Pods using [Direct Attached Storage](https://en.wikipedia.org/wiki/Direct-attached_storage). It comes with two components.
+1. `DirectPV plugin` - To be installed on local machine, to manage DirectPV CSI driver.
+2. `DirectPV CSI driver` - To be installed on kubernetes cluster, to provision local volumes.
+
+## For new users
+Refer below documentation
+* [Installation guide](./installation.md)
+* [Drive management guide](./drive-management.md)
+* [Volume provisioning guide](./volume-provisioning.md)
+* [Volume management guide](./volume-management.md)
+* [Command reference guide](./command-reference.md)
+* [Monitoring guide](./monitoring.md)
+
+## For existing users
+Refer below documentation
+* [Upgrade guide](./upgrade.md)
+* [Node management guide](./node-management.md)
+
+## Further references
+* [Volume scheduling guide](./volume-scheduling.md)
+* [Issue reporting](./issue-reporting.md)
+* [DirectPV CSI driver specification](./specification.md)
+* [Troubleshooting guide](./troubleshooting.md)