add support.md

Signed-off-by: Isaac Milarsky <[email protected]>

SUPPORT.md

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+# Support
+
+This article explains where to get help with DSACMS/metrics.
+Please read through the following guidelines.
+
+<!-- TODO: Fill out where to get support -->
+## Contributions
+
+See [`contributing.md`][contributing] on how to contribute.
+
+
+## License
+
+[CC0 1.0][license]
+
+<!-- Definitions -->
+
+[license]: https://creativecommons.org/publicdomain/zero/1.0/legalcode
+
+[contributing]: CONTRIBUTING.md