Add demo project

demo/.gitattributes

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

demo/.gitignore

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+# Godot 4+ specific ignores
+.godot/

demo/addons/cesium-godot/cesium-godot.gdextension

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+[configuration]
+entry_symbol = "GDExtensionInit"
+compatibility_minimum = 4.1
+
+[icons]
+Example = "icons/Example.svg"
+
+[libraries]
+linux.debug.x86_64 = "lib/Linux-x86_64/libcesium-godot-d.so"
+macos.debug = "lib/Darwin-Universal/libcesium-godot-d.dylib"
+windows.debug.x86_64 = "lib/Windows-AMD64/cesium-godot-d.dll"

demo/addons/cesium-godot/icons/Example.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://dao814wlfjtla"
+path="res://.godot/imported/Example.svg-48983e07ca2a1b509ce1a2772e742e21.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://addons/cesium-godot/icons/Example.svg"
+dest_files=["res://.godot/imported/Example.svg-48983e07ca2a1b509ce1a2772e742e21.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

demo/icon.svg.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://cdw3fxelk41so"
+path="res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.svg"
+dest_files=["res://.godot/imported/icon.svg-218a8f2b3041327d8a5756f3a245f83b.ctex"]
+
+[params]
+
+compress/mode=0
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=false
+mipmaps/limit=-1
+roughness/mode=0
+roughness/src_normal=""
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/normal_map_invert_y=false
+process/hdr_as_srgb=false
+process/hdr_clamp_exposure=false
+process/size_limit=0
+detect_3d/compress_to=1
+svg/scale=1.0
+editor/scale_with_editor_scale=false
+editor/convert_colors_with_editor_theme=false

demo/main.tscn

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+[gd_scene format=3 uid="uid://dkklw300gsxdi"]
+
+[node name="Main" type="Node3D"]
+
+[node name="Example" type="Example" parent="."]
+offset_right = 40.0
+offset_bottom = 40.0

demo/project.godot

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+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=5
+
+[application]
+
+config/name="cesium-demo"
+run/main_scene="res://main.tscn"
+config/features=PackedStringArray("4.2", "Forward Plus")
+config/icon="res://icon.svg"