Update index.yml

Author: Juliako

articles/azure-video-indexer/index.yml

@@ -52,6 +52,8 @@ landingContent:
             url: create-account-portal.md
           - text: Connect an existing classic account to ARM
             url: connect-classic-account-to-arm.md
+          - text: Import your content from the trial account
+            url: import-content-from-trial.md
           - text: Use Azure Video Indexer API
             url: video-indexer-use-apis.md 
           - text: Upload and index your videos