Add OpenXR hand tracking demo

xr/openxr_hand_tracking_demo/.gitattributes

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+# Normalize EOL for all files that Git considers text files.
+* text=auto eol=lf

xr/openxr_hand_tracking_demo/.gitignore

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+# Godot 4+ specific ignores
+.godot/
+
+# Ignore our Android build folder, should be installed by user if needed
+android/
+
+# Ignore our OpenXR loader add-on, should be installed by user if needed
+addons/godotopenxr

xr/openxr_hand_tracking_demo/assets/valve_hand_models/LICENSE

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+Copyright (c), Valve Corporation
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this
+list of conditions and the following disclaimer.
+
+2. Redistributions in binary form must reproduce the above copyright notice,
+this list of conditions and the following disclaimer in the documentation and/or
+other materials provided with the distribution.
+
+3. Neither the name of the copyright holder nor the names of its contributors
+may be used to endorse or promote products derived from this software without
+specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

xr/openxr_hand_tracking_demo/assets/valve_hand_models/README

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+The model files and textures in this folder are Copyright (c) Valve. All Rights Reserved.
+
+They are made available under the terms of the attached LICENSE file.
+
+Original files including blend and fbx versions can be found at: https://github.com/JoeLudwig/xrsandbox/tree/master/projects/xrsandbox/assets/models/valve_hand_models

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