add networking service section

Author: duongau

articles/networking/hybrid-connectivity/index.yml

@@ -163,3 +163,17 @@ conceptualContent:
             - url: /azure/architecture/networking/architecture/massive-scale-azure-architecture
               itemType: architecture
               text: Massive scale Virtual WAN architecture design
+
+# Card with summary style
+additionalContent:
+  sections:
+    - title: Networking services
+      items:
+        - title: Network foundation
+          url: ../foundations/index.yml
+        - title: Load balancing and content delivery
+          url: ../load-balancer-content-delivery/index.yml
+        - title: Network security
+          url: ../security/index.yml
+        - title: Network monitoring and management
+          url: /azure/networking/monitoring-management/index.yml