Add image assets from prototype.

.gitmodules

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+[submodule "addons/GPUTrail"]
+	path = addons/GPUTrail
+	url = https://github.com/celyk/GPUTrail.git

addons/GPUTrail

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+Subproject commit 8e3931ccc038729ed667d7e4eec052f78b5a026f

assets/images/bullet.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://denfapnjlvmku"
+path.s3tc="res://.godot/imported/bullet.png-233c01ebf7a36dda9b4884fdef5413e0.s3tc.ctex"
+metadata={
+"imported_formats": ["s3tc_bptc"],
+"vram_texture": true
+}
+
+[deps]
+
+source_file="res://assets/images/bullet.png"
+dest_files=["res://.godot/imported/bullet.png-233c01ebf7a36dda9b4884fdef5413e0.s3tc.ctex"]
+
+[params]
+
+compress/mode=2
+compress/high_quality=false
+compress/lossy_quality=0.7
+compress/hdr_compression=1
+compress/normal_map=0
+compress/channel_pack=0
+mipmaps/generate=true
+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=0

assets/images/resources.png.import

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+[remap]
+
+importer="texture"
+type="CompressedTexture2D"
+uid="uid://bk00ob4e7jyyi"
+path="res://.godot/imported/resources.png-18a8ed85be40ec3d533aa02211f35c88.ctex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://assets/images/resources.png"
+dest_files=["res://.godot/imported/resources.png-18a8ed85be40ec3d533aa02211f35c88.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