Add products taxonomy to improve findability

[kenanlv]

Adds docs products taxonomy to the repo to improve findability experiences (onsite search, recommendations and others)

Product Label	Products
Xamarin	https://authoring-docs-microsoft.poolparty.biz/devrel/f0c462af-0ef9-4821-b36f-ba3d94736e2b

[conceptdev]

Docs Build status updates of commit ccadbe9:

✅ Validation status: passed

File	Status	Preview URL	Details
SkiaSharpAPI/docfx.json	✅Succeeded

For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

For any questions, please:

• Try searching the docs.microsoft.com contributor guides
• Post your question in the Docs support channel

[learn-build-service-prod]

Learn Build status updates of commit cac7445:

✅ Validation status: passed

File	Status	Preview URL	Details
SkiaSharpAPI/docfx.json	✅Succeeded

For more details, please refer to the build report.

For any questions, please:

• Try searching the learn.microsoft.com contributor guides
• Post your question in the Learn support channel