add copilot card

Author: vhorne

articles/firewall/index.yml

@@ -85,6 +85,15 @@ landingContent:
           - text: Deploy Firewall Basic
             url: deploy-firewall-basic-portal-policy.md
 
+  # Card
+  - title: Learn about Azure Firewall integration in Copilot for Security
+    linkLists:
+      - linkListType: concept
+        links:
+         - text: Azure Firewall integration in Microsoft Copilot for Security (preview)
+           url: firewall-copilot.md
+
+  
   # Card
   - title: Integrate with Load Balancer
     linkLists: