Create AUTHORS.md

All the people that github says contributed to any of the files. Authors from the addon description in Blender will be changed to a more generic "OpenMW Community" rather than individuals.

Author: Lamoot

AUTHORS.md

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+
+Contributors
+============
+
+The OpenMW Collada Exporter is based on the [Godot engine's](https://godotengine.org/)
+Better Collada Exporter and adjusted for [OpenMW](https://openmw.org) needs.
+The original exporter was initially written by Juan Linietsky (reduz)
+and improved by various contributors.
+
+    reduz
+    akien-mga
+    set-killer
+    unelsson
+    Lamoot
+    slapin
+    SaracenOne
+    pkowal1982
+    artellblender
+    bdero
+    sburris0
+    romulox-x
+    placasse
+    TheJosh
+    jitspoe
+    adolson
+    QbieShay
+    bojidar-bg