Add CONTRIBUTORS file

CONTRIBUTORS

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+All Lightspark contributors recorded in git logs, in alphabetical order:
+
+Alessandro Pignotti <a.pignotti@sssup.it>
+Alexandre Demers <papouta@hotmail.com>
+Anand Kumria <akumria@acm.org>
+Antti Ajanki <antti.ajanki@iki.fi>
+Arthur HUILLET <arthur.huillet@free.fr>
+bzztbomb <skinny@knowhere.net>
+cdc <cdc@riflessivo.allievi.sssup.it>
+Daniele Di Proietto <d.diproietto@sssup.it>
+DaNiMoTh <jjdanimoth@gmail.com>
+Didier Raboud <odyx@debian.org>
+Dmitry Marakasov <amdmi3@amdmi3.ru>
+Dongxu Li <dongxuli2011@gmail.com>
+Elliott Sales de Andrade <quantum.analyst@gmail.com>
+Ennio Barbaro <e.barbaro@sssup.it>
+Frank Wienberg <frank.wienberg@coremedia.com>
+Giacomo Spigler <g.spigler@sssup.it>
+Gwenole Beauchesne <gbeauchesne@splitted-desktop.com>
+Henri Valta <cg@jakorasia.info>
+Hicham HAOUARI <hicham.haouari@gmail.com>
+Jacopo Corbetta <jacopo.corbetta@gmail.com>
+Jani Monoses <jani@ubuntu.com>
+Jasper St. Pierre <jstpierre@mecheye.net>
+Joerg Mayer <jmayer@loplof.de>
+Jon Morton <jonanin@gmail.com>
+Joshua Roys <roysjosh@gmail.com>
+Luca Invernizzi <l.invernizzi@gmail.com>
+Luca Tettamanti <kronos.it@gmail.com>
+Ludger Krämer <dbluelle@blau-weissoedingen.de>
+Marcin 'exine' M <exine@jun.pl>
+Matthias Gehre <M.Gehre@gmx.de>
+Max Lapshin <max@maxidoors.ru>
+nobled <nobled@dreamwidth.org>
+Pat Wilson <zerostride@gmail.com>
+piotr <banthar@gmail.com>
+Rémi C <remicretois@yahoo.fr>
+robert.ancell@gmail.com <robert.ancell@gmail.com>
+Thomas Dziedzic <gostrc@gmail.com>
+Timon Van Overveldt <timonvo@gmail.com>
+Tim Retout <tim@retout.co.uk>