Initial add of Support.md (microsoft#55962)

Co-authored-by: Daniel Rosenwasser <[email protected]>

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](https://github.com/microsoft/TypeScript/issues) before filing new issues to avoid duplicates. For new issues, file your bug or feature request as a new issue.
+
+For help and questions about using this project, please see the [`typescript` label on Stack Overflow](https://stackoverflow.com/questions/tagged/typescript) or the [`#typescript` channel on Discord](https://discord.com/invite/typescript).
+
+## Microsoft Support Policy
+
+TypeScript releases may include new features, fixes (security and/or non-security), or a combination of both. Some critical issues may be fixed in a servicing update to the latest release. When included with a Microsoft product, TypeScript support and servicing is offered under the [Modern Support Policy](https://learn.microsoft.com/lifecycle/policies/modern). For Visual Studio, servicing fixes are limited to security fixes for versions of TypeScript included in under-support releases of Visual Studio. Community support for this project is limited to the resources listed above. Assisted support is available from a professional support engineer by opening a ticket with the [Microsoft assisted support team](https://support.serviceshub.microsoft.com/supportforbusiness/onboarding).