Add AUTHORS.md.

AUTHORS.md

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+# Authors
+
+-   [Mohit Muthanna Cheppudira](https://github.com/0xfe)
+-   [Michael Scott Cuthbert](https://github.com/mscuthbert)
+-   [Larry Kuhns](https://github.com/LarryKu)
+-   [Tom Madams](https://github.com/tommadams)
+-   [Aaron Mars](https://github.com/aaronmars)
+-   [Taehoon Moon](https://github.com/panarch)
+-   [Aaron David Newman](https://github.com/AaronDavidNewman)
+-   [Gregory Ristow](https://github.com/gristow)
+-   [Cyril Silverman](https://github.com/Silverwolf90)
+-   [sug1no](https://github.com/sug1no)
+-   [Rodrigo Vilar](https://github.com/rvilarl)
+-   [Ron B. Yeh](https://github.com/ronyeh)
+
+<sup>_listed alphabetically by last name_</sup>
+
+### Thanks to [all of our contributors](https://github.com/0xfe/vexflow/graphs/contributors)!