Create CONTRIBUTORS.md

Author: tcmitchell

CONTRIBUTORS.md

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+# geni-portal Contributors
+
+Contributors, in alphabetical order:
+
+* Aaron Helsinger, Raytheon BBN Technologies
+* Ben Ujcich, Clemson University & Raytheon BBN Technologies
+* Chaos Golubitsky, Raytheon BBN Technologies
+* Charlie Meyer, Tufts University & Raytheon BBN Technologies
+* David Montana, Raytheon BBN Technologies
+* Joao F. Santos, Trinity College Dublin
+* Keith Downie, University of Utah & Raytheon BBN Technologies
+* Marshall Brinn, Raytheon BBN Technologies
+* Mike Thome, Raytheon BBN Technologies
+* Pam Helinek, Raytheon BBN Technologies
+* Regina Hain, Raytheon BBN Technologies
+* Sarah Edwards, Raytheon BBN Technologies
+* Tom Mitchell, Raytheon BBN Technologies
+
+Contributors recognized by GitHub are listed [on GitHub](https://github.com/GENI-NSF/geni-portal/graphs/contributors).