Create MAINTAINERS.md

Author: darrelmiller

MAINTAINERS.md

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+## Active
+* Darrel Miller [@darrelmiller](https://github.com/darrelmiller)
+* Jeremy Whitlock [@whitlockjc](https://github.com/whitlockjc)
+* Marsh Gardiner [@earth2marsh](https://github.com/earth2marsh)
+* Ron Ratovsky [@webron](https://github.com/webron)
+
+## Emeritus
+* Jason Harmon [@jharmn](https://github.com/jharmn)
+* Tony Tam [@fehguy](https://github.com/fehguy)