Add multiple resources tutorial

Author: metanMSFT

articles/cognitive-services/immersive-reader/index.yml

@@ -39,6 +39,8 @@ landingContent:
         links:
           - text: Python
             url: tutorial-python.md
+          - text: Use multiple Immersive Reader resources
+            url: tutorial-multiple-resources.md
 
   - title: Explore Immersive Reader
     linkLists:

articles/cognitive-services/immersive-reader/toc.yml

@@ -17,6 +17,8 @@
   items:
   - name: Launch the Immersive Reader (Python)
     href: tutorial-python.md
+  - name: Use multiple Immersive Reader resources
+    href: tutorial-multiple-resources.md
 - name: How-To
   items:
   - name: Create Immersive Reader resource