Add Windows multiple VM with Extension

Scripts/README.md

@@ -90,3 +90,33 @@ Step 2: Use the following Azure CLI to create VM(s)
     az login
     az group create --name [[NAME OF RESOURCE GROUP]] --location [[ Data center. For eg: "West US 2"]
     az group deployment create --resource-group  [[NAME OF RESOURCE GROUP ABOVE]]  --template-uri https://raw.githubusercontent.com/Azure/DataScienceVM/master/Scripts/CreateDSVM/Ubuntu/multiazuredeploywithext.json --parameters @[[PARAMETER JSON FILE]]
+
+### Creating multiple instances of DSVM for Windows 2012 using command line and execute a post install script on the VM Instance
+
+To create multiple Windows 2012 DSVMs in one shot using Azure CLI Version 2 (ARM template - multiazuredeploywithext.json available in the CreateDSVM/Windows2012 directory and used below) use the steps below. This also executes a post install Powershell script that can configure the VM to your needs or install any additional packages you want on the VM. 
+
+Step 1: Create a Parameter file (JSON) for the DSVM you are going to deploy. The file looks like this:
+
+````
+{
+  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentParameters.json#",
+  "contentVersion": "1.0.0.0",
+  "parameters": {
+     "adminUsername": { "value" : "YOURUSERNAME FOR NEW DSVM"},
+     "adminPassword": { "value" : "PASSWORD FOR NEW DSVM"},
+     "vmName": { "value" : "HOSTNAME OF DSVM"},
+     "vmSize": { "value" : "VM SIZE For eg: Standard_DS2_v2"},
+     "fileUris": { "value" : "PUBLIC URL CONTAINING YOUR POST INSTALL BASH SCRIPT PACKAGE"},
+     "commandToExecute": { "value" : "POWERSHELL SCRIPT FILE <any arguments to script>"},
+     "numberOfInstances": { "value" : "NUMBER OF VM INSTANCES TO CREATE"}	      
+  }
+}
+````
+Replace the parameters with values you will use for your new DSVM you are creating. A list of allowed vmSize is found in the [Windows 2012 DSVM ARM template](CreateDSVM/Windows2012/multiazuredeploywithext.json). 
+
+Step 2: Use the following Azure CLI to create VM(s)
+
+    # Follow instructions of az login to signin to your Azure account. May need to select subscription if you have multiple
+    az login
+    az group create --name [[NAME OF RESOURCE GROUP]] --location [[ Data center. For eg: "West US 2"]
+    az group deployment create --resource-group  [[NAME OF RESOURCE GROUP ABOVE]]  --template-uri https://raw.githubusercontent.com/Azure/DataScienceVM/master/Scripts/CreateDSVM/Windows2012/multiazuredeploywithext.json --parameters @[[PARAMETER JSON FILE]]