Document third party references

[JenniBee]

We'll need to keep track of any third party references and licenses that are used.

Name: Godot engine Type: Source code Source URL: https://github.com/godotengine/godot License URL: https://github.com/godotengine/godot/blob/master/LICENSE.md Site URL: https://godotengine.org/ License: MIT Version: 2.1-beta

Name: godot_pointandclickadv Type: Source code Source URL: https://github.com/StraToN/godot_pointandclickadv License URL: https://github.com/StraToN/godot_pointandclickadv/blob/master/LICENCE.md License: MIT Version: demo

Name: dialog_template Type: Source code Source URL: https://github.com/alexwbc/dialogue_template License: no license, but the author allows modification Version: demo

Name: DejaVu Sans Type: Font Download URL: http://dejavu-fonts.org/wiki/Download License URL: http://dejavu-fonts.org/wiki/License Site URL: http://dejavu-fonts.org/ License: Copyrighted and licensed under a free license Version: 2.36

If there is anything else used, please mention it below.