Added info on Azure Policy for auto stop

Author: shouryaj

articles/machine-learning/how-to-create-manage-compute-instance.md

@@ -210,6 +210,59 @@ This setting can be configured during CI creation or for existing CIs via the fo
     }
     ```
 
+### Azure policy support
+Administrators can use a built-in [Azure Policy](./../governance/policy/overview.md) definition to enfore auto-stop on all compute instances in a give subsription/resource-group. 
+
+1. Navigate to Azure Policy in the Azure Portal
+2. Under "Definitions", look for the idle shutdown policy
+   :::image type="content" source="media/how-to-create-attach-studio/idle-shutdown-policy.png" alt-text="Screenshot for the idle shutdown policy in Azure Portal.":::
+
+3. Assign policy to the necessary scope
+
+You can also create your own custom Azure policy. For example, if the below policy is assigned, all new compute instances will have auto-stop configured with a 30 minute inactivity period. 
+```json
+{
+  "mode": "All",
+  "policyRule": {
+    "if": {
+      "allOf": [
+        {
+          "field": "type",
+          "equals": "Microsoft.MachineLearningServices/workspaces/computes"
+        },
+        {
+          "field": "Microsoft.MachineLearningServices/workspaces/computes/computeType",
+          "equals": "ComputeInstance"
+        },
+        {
+          "anyOf": [
+            {
+              "field": "Microsoft.MachineLearningServices/workspaces/computes/idleTimeBeforeShutdown",
+              "exists": false
+            },
+            {
+              "value": "[empty(field('Microsoft.MachineLearningServices/workspaces/computes/idleTimeBeforeShutdown'))]",
+              "equals": true
+            }
+          ]
+        }
+      ]
+    },
+    "then": {
+      "effect": "append",
+      "details": [
+        {
+          "field": "Microsoft.MachineLearningServices/workspaces/computes/idleTimeBeforeShutdown",
+          "value": "PT60M"
+        }
+      ]
+    }
+  },
+  "parameters": {}
+}
+```
+
+
 ## Create on behalf of (preview)
 
 As an administrator, you can create a compute instance on behalf of a data scientist and assign the instance to them with: