obs quickstart added to ams toc

Author: IngridAtMicrosoft

articles/media-services/latest/TOC.yml

@@ -13,6 +13,9 @@
   - name: Live event with portal and Wirecast
     displayName: live, event, portal, wirecast
     href: live-events-wirecast-quickstart.md
+  - name: Live event with portal and OBS
+    displayName: live, event, portal, obs
+    href: live-events-obs-quickstart.md
 - name: Tutorials
   items:
   - name: Encode remote file and stream video