Adding product link

Author: djrmetaswitch

articles/private-5g-core/toc.yml

@@ -62,6 +62,8 @@ items:
       href: activate-sims.md
 - name: Resources
   items:
+  - name: Azure Private 5G Core product page
+    href: https://azure.microsoft.com/services/private-5g-core/
   - name: Azure private MEC documentation
     href: https://docs.microsoft.com/azure/private-multi-access-edge-compute-mec/
   - name: Azure Roadmap