Add authors files.

AUTHORS

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+This is an (incomplete) list of people who have contributed to the
+codebase which lives in this repository. If you make a contribution
+here, you may add your name and, optionally, email address in the
+appropriate place.
+
+Adil Allawi <@ironymark>
+Andreas Gal <gal@mozilla.com>
+Artur Adib <aadib@mozilla.com>
+Brendan Dahl <bdahl@mozilla.com>
+Chris G Jones <cjones@mozilla.com>
+David Quintana <gigaherz@gmail.com>
+Jakob Miland <saebekassebil@gmail.com>
+Julian Viereck
+Justin D'Arcangelo <justindarc@gmail.com>
+Kalervo Kujala
+Shaon Barman <shaon.barman@gmail.com>
+Vivien Nicolas <21@vingtetun.org>
+Yury Delendik <ydelendik@mozilla.com>