docs: add SUPPORT.md (#2991)

SUPPORT.md

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+# Support
+
+## How to file issues and get help
+
+This project uses GitHub issues to track bugs and feature requests. Please search the [existing issues][gh-issues] before filing new ones to avoid duplicates. For new issues, file your bug or feature request as a new issue using corresponding template.
+
+For help and questions about using this project, please see the [docs site for Playwright for .NET][docs].
+
+Join our community [Discord Server][discord-server] to connect with other developers using Playwright and ask questions in our 'help-playwright' forum.
+
+## Microsoft Support Policy
+
+Support for Playwright for .NET is limited to the resources listed above.
+
+[gh-issues]: https://github.com/microsoft/playwright-dotnet/issues/
+[docs]: https://playwright.dev/dotnet/
+[discord-server]: https://aka.ms/playwright/discord