Create install-driver-on-aks.md

Author: andyzhangx

docs/install-driver-on-aks.md

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+## Set up CSI driver on AKS cluster
+
+ - Prerequisites
+
+AKS cluster is created with user asissnged identity by default, make sure cluster identity has `Contributor` role on node resource group, follow below instruction to set up `Contributor` role on node resource group
+![image](https://user-images.githubusercontent.com/4178417/120978367-f68f0a00-c7a6-11eb-8e87-89247d1ddc0b.png):
+
+
+ - Install CSI driver
+
+install latest **released** CSI driver version, following guide [here](./install-blob-csi-driver.md)
+
+ - Set up new storage classes
+```console
+kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/storageclass-blobfuse.yaml
+kubectl create -f https://raw.githubusercontent.com/kubernetes-sigs/blob-csi-driver/master/deploy/example/storageclass-blob-nfs.yaml
+```