Add info about plugin compatibility and features

Author: wozniakjan

README.md

@@ -1,6 +1,17 @@
 # CSI NFS driver
 
-## Kubernetes
+## Overview
+
+This is a repository for [NFS](https://en.wikipedia.org/wiki/Network_File_System) [CSI](https://kubernetes-csi.github.io/docs/) Driver.
+Currently it implements bare minimum of the CSI and the state is alpha.
+
+#### CSI Feature matrix
+
+| **nfs.csi.k8s.io** | CSI versions compatibility| Dynamic Provisioning             | Resize                           | Snapshots                        | Raw Block                        | AccessModes              | Status |
+|--------------------|---------------------------|----------------------------------|----------------------------------|----------------------------------|----------------------------------|--------------------------|--------|
+|master              | v1.0.0, v1.1.0            | <div class="text-red"> no </div> | <div class="text-red"> no </div> | <div class="text-red"> no </div> | <div class="text-red"> no </div> | Read/Write Multiple Pods | Alpha  |
+|v1.0.0              | v1.0.0, v1.1.0            | <div class="text-red"> no </div> | <div class="text-red"> no </div> | <div class="text-red"> no </div> | <div class="text-red"> no </div> | Read/Write Multiple Pods | Alpha  |
+
 ### Requirements
 
 The folllowing feature gates and runtime config have to be enabled to deploy the driver