Add a SUPPORT.md file

Author: brettcannon

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/vscode-python/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 [`python`+`visual-studio-code` labels on Stack Overflow](https://stackoverflow.com/questions/tagged/visual-studio-code+python) or the `#vscode` channel on the [`microsoft-python` server on Discord](https://aka.ms/python-discord-invite).
+
+## Microsoft Support Policy
+
+Support for this project is limited to the resources listed above.