Add AUTHORS file

- Generated from previous authors in Swift git repository for bin/swift
  swift.common.client and tests.common.test_client.

AUTHORS

@@ -0,0 +1,19 @@
+Anne Gentle <anne@openstack.org>
+Chmouel Boudjnah <chmouel@chmouel.com>
+Chuck Thier <cthier@gmail.com>
+Clay Gerrard <clay.gerrard@gmail.com>
+David Goetz <david.goetz@rackspace.com>
+Dean Troyer <dtroyer@gmail.com>
+Donagh McCabe <donagh.mccabe@hp.com>
+Doug Weimer <dougw@sdsc.edu>
+Dragos Manolescu <dragosm@hp.com>
+Eamonn O'Toole <eamonn.otoole@hp.com>
+Felipe Reyes <freyes@tty.cl>
+Greg Holt <gholt@rackspace.com>
+Jay Payne <letterj@racklabs.com>
+John Dickinson <me@not.mn>
+Julien Danjou <julien.danjou@enovance.com>
+Marcelo Martins <btorch@gmail.com>
+Monty Taylor <mordred@inaugust.com>
+Pete Zaitcev <zaitcev@kotori.zaitcev.us>
+Thierry Carrez <thierry@openstack.org>