Added Contributors

closes #268

CONTRIBUTORS.md

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+Gregory Kurtzer <gmkurtzer@gmail.com> @gmk
+Christian Goll <cgoll@suse.de> @mslacken
+Niko Kivel <niko.kivel@psi.ch> @kivel
+Jeremy Siadal <jeremy.c.siadal@intel.com> @jcsiadal
+Shannon V. Davidson <svdavidson@charter.net> 
+Brian Clemens <brian@ctrliq.com> @brianclemens
+Michael L. Young <myoung@ciq.co> @ajyounge
+Ian Kaneshiro <iankane@umich.edu> @ikaneshiro
+MatthewHink <matthew_hink@yahoo.com> @MatthewHink
+WestleyR <westleyr@nym.hush.com> @WestleyK
+Michael L. Young <elgueromexicano@gmail.com>
+Yong Qin <yongq@nvidia.com> 
+Yoshiaki SENDA <yoshiaki@live.it>
+Cooper, Trevor <tcooper@sdsc.edu> 
+Masahiko OHKUBO <masahiko.ohkubo+github@gmail.com>
+John Hanks <griznog@gmail.com> @griznog
+Rob Jansen <jansen@cs.umn.edu>
+svdavidson <svdavidson@charter.net>
+David McFarlane <54093156+Prepultrue@users.noreply.github.com>
+TerranWorks <tdunn3@uco.edu>