Add AUTHORS list crediting developers
Add AUTHORS list crediting developers

(cherry picked from commit 21bcb71b2caa6e833338e40c915f7e353a377754)

pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1,pixelpicosean/my-godot-2.1