global: add AUTHORS file

Author: slint

AUTHORS.rst

@@ -0,0 +1,29 @@
+..
+    This file is part of Invenio.
+    Copyright (C) 2018 CERN.
+
+    Invenio is free software; you can redistribute it and/or modify it
+    under the terms of the MIT License; see LICENSE file for more details.
+
+Contributors
+============
+
+- Achintya Rao
+- Adam Lawrence
+- Alizee Pace
+- Diego Rodriguez
+- Esteban J. G. Gabancho
+- Guillaume Lastecoueres
+- Ivan Masár
+- Javier Delgado
+- Jiri Kuncar
+- João Gonçalves
+- Lars Holm Nielsen
+- Leonardo Rossi
+- Nicola Tarocco
+- Nicolas Harraudeau
+- Rémi Ducceschi
+- Sami Hiltunen
+- Samuele Kaplun
+- Tibor Simko
+- Xiao Meng