Backfill missing lab metadata for Instructions/Exercises/M05-Unit 4 Deploy Azure application gateway.md

Author: LuizMacedo

Instructions/Exercises/M05-Unit 4 Deploy Azure application gateway.md

@@ -1,7 +1,15 @@
 ---
-Exercise:
-    title: 'M05 - Unit 4 Deploy Azure Application Gateway'
-    module: 'Module 05 - Load balancing HTTP(S) traffic in Azure'
+lab:
+  title: M05-Unit 4 Deploy Azure Application Gateway
+  description: In this exercise, you use the Azure portal to create an application
+    gateway. Then you test it to make sure it works correctly.
+  duration: 25 minutes
+  level: 400
+  islab: true
+  primarytopics:
+  - Azure
+  - Azure Application Gateway
+  - Azure Portal
 ---
 
 # M05-Unit 4 Deploy Azure Application Gateway