Add support.md #81 (#82)

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 before filing new issues to avoid duplicates.
+
+- For new issues, file your bug or feature request as a new [issue].
+- For help, discussion, and support questions about using this project, join or start a [discussion].
+
+## Microsoft Support Policy
+
+Support for this project/ product is limited to the resources listed above.
+
+[issue]: https://github.com/microsoft/ps-rule/issues
+[discussion]: https://github.com/microsoft/ps-rule/discussions