add products taxonomy to improve findability (#30)

Co-authored-by: David Britch <davidbritch@users.noreply.github.com>

Author: kenanlv

SkiaSharpAPI/docfx.json

@@ -51,6 +51,7 @@
       "ms.date": "04/04/2019",
       "searchScope": ["SkiaSharp API"],
       "uhfHeaderId": "MSDocsHeader-DotNet",
+      "products": ["https://authoring-docs-microsoft.poolparty.biz/devrel/f0c462af-0ef9-4821-b36f-ba3d94736e2b"],
       "ms.topic": "managed-reference"
     },
     "fileMetadata": {