Update README.md

Author: andyzhangx

charts/README.md

@@ -10,6 +10,11 @@ From `v0.7.0`, driver name changed from `blobfuse.csi.azure.com` to `blob.csi.az
  - make controller only run on master node: `--set controller.runOnMaster=true`
  - enable `fsGroupPolicy` on a k8s 1.20+ cluster: `--set feature.enableFSGroupPolicy=true`
  - set replica of controller as `1`: `--set controller.replicas=1`
+ - specify different cloud config secret for the driver:
+   - `--set controller.cloudConfigSecretName`
+   - `--set controller.cloudConfigSecretNamesapce`
+   - `--set node.cloudConfigSecretName`
+   - `--set node.cloudConfigSecretNamesapce`
 
 ## install latest version
 ```console