Feat(Tools) adds authors.md

Adds the first version of authors.md to Tools.

AUTHORS.md

+FusionDirectory Tools AUTHORS
+=============================
+
+This is the alphabetical list of all people that have
+contributed to the FusionDirectory Tools project, beeing code, translations,
+documentation and additional help.
+
+* Antoine Gallavardin antoine.gallavardin@free.fr
+  Creation and development of PluginManager in Perl
+* Bernigaud Côme come.bernigaud@laposte.net
+  Creation and development of Tools.
+* Dockx Thibault thibault.dockx@fusiondirectory.org
+  Evolution of PluginManager to PHP.
+  Creation of namespaces and update of overall code.