Update README.md

Author: andyzhangx

README.md

@@ -3,7 +3,7 @@
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 ### About
-This driver allows Kubernetes to use [SMB](https://wiki.wireshark.org/SMB) CSI volume, csi plugin name: `smb.csi.k8s.io`
+This driver allows Kubernetes to use [SMB](https://wiki.wireshark.org/SMB) CSI volume, csi plugin name: `smb.csi.k8s.io`. This driver requires existing and already configured SMB server, it supports dynamic provisioning of Persistent Volumes via Persistent Volume Claims by creating a new sub directory under SMB server.
 
 ### Project status: GA