Add README and LICENSE

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>

README.md

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+# Godot glTFX Reference Format
+
+Godot implementation of the [glTFX Reference Format](https://github.com/KhronosGroup/glTF-External-Reference), also known as glTF External Reference, glTF Experience Format, or glXF. The glTFX format allows for referencing external glTF files, and also other glTFX files, allowing for a nested scene hierarchy of arbitrary depth, with its leaf scenes being glTF files.
+
+**Note:** The glTFX Reference Format is still a work in progress and is not yet ratified by the Khronos Group. Until glTFX is finalized, this addon should be considered experimental and subject to change at any time to comply with the latest iteration of the draft specification.
+
+For full functionality, this addon requires Godot 4.4 or later with [this PR](https://github.com/godotengine/godot/pull/94603). It can be used with Godot 4.3, but the export settings will not be available.
+
+The addon is licensed under The Unlicense. Anyone is free to use this without restriction. Credit is appreciated but not required.
+
+Here is an example of exporting a glTFX scene which contains another glTFX scene which contains a cube glTF file. The file hierarchy is preserved both when exporting from Godot and importing into Godot.
+![Nested glTFX example](preview_images/nested_gltfx.png)

project.godot

@@ -10,8 +10,8 @@ config_version=5
 
 [application]
 
-config/name="glTFX Reference Format"
-config/features=PackedStringArray("4.3", "GL Compatibility")
+config/name="glTFX Reference Format Test Project"
+config/features=PackedStringArray("4.4", "GL Compatibility")
 config/icon="res://icon.svg"
 
 [editor_plugins]