Redirect sdks landing page

Author: rolyon

.openpublishing.redirection.json

@@ -49251,6 +49251,11 @@
       "redirect_url": "/azure/cognitive-services/Speech-Service/how-to-use-codec-compressed-audio-input-streams?pivots=programming-language-objectivec",
       "redirect_document_id": false
     },
+    {
+      "source_path": "articles/sdks/index.yml",
+      "redirect_url": "https://azure.microsoft.com/downloads/",
+      "redirect_document_id": false
+    },
     {
       "source_path": "articles/power-bi-embedded/index.md",
       "redirect_url": "https://docs.microsoft.com/power-bi/developer/azure-pbie-what-is-power-bi-embedded",