Add some missing AUTHORS

AUTHORS

@@ -117,7 +117,6 @@ Javier Orts Peñarrocha <jorts@upv.es>
 Stephen Sanchez <steve@edx.org>
 Jim Abramson <jsa@edx.org>
 Chris Rossi <chris@archimedeanco.com>
-Carson Gee <x@carsongee.com>
 Oleg Marshev <oleh.marshev@gmail.com>
 Sylvia Pearce <spearce@edx.org>
 Olga Stroilova <olga@edx.org>
@@ -149,3 +148,6 @@ Kristin Stephens <ksteph@cs.berkeley.edu>
 Ben Patterson <bpatterson@edx.org>
 Luis Duarte <lduarte1991@gmail.com>
 Steven Burch <stv@stanford.edu>
+Waqas Khalid <wkhalid@edx.org>
+Muhammad Ammar <mammar@edx.org>
+Abdallah Nassif <abdoosh00@gmail.com>