Add URI test assets

Models/UriTest/README.body.md

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+## Screenshots
+
+![Screenshot from three.js](screenshot/screenshot.png)  
+![Screenshot from three.js](screenshot/screenshot2.png)
+
+## Description
+
+This asset demonstrates allowed usage of URIs in glTF.
+
+- URIs using percent encoding
+- URIs using JSON-string escaping
+- URIs using utf8 paths
+- URIs pointing at child folders
+- URIs pointing at parent folders
+
+According to the glTF spec, these URI types MAY be supported:
+- http:// or https:// URIs pointing at absolute paths
+- Non-normalized URIs
+
+See [glTF-2.0#uris](https://registry.khronos.org/glTF/specs/2.0/glTF-2.0.html#uris) for more information.
+
+## Creation Details
+
+The asset was created using [UnityGLTF](https://github.com/KhronosGroup/UnityGLTF), and the files were edited in [Visual Studio Code](https://code.visualstudio.com/) with [glTF Tools](https://github.com/AnalyticalGraphicsInc/gltf-vscode#gltf-tools-extension-for-visual-studio-code).

Models/UriTest/glTF-UriTest-01-RelativeTexture-NoUTF8/RelativeResourcePaths.gltf

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+{
+  "asset": {
+    "generator": "UnityGLTF",
+    "version": "2.0"
+  },
+  "scene": 0,
+  "scenes": [
+    {
+      "nodes": [
+        0
+      ],
+      "name": "RelativeResourcePaths"
+    }
+  ],
+  "accessors": [
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+      "type": "VEC3",
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+      "type": "VEC3",
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+      "type": "VEC4",
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+    {
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+      "type": "VEC2",
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+    {
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+      "componentType": 5126,
+      "count": 515,
+      "type": "VEC2",
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+    {
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+      "count": 2304,
+      "type": "SCALAR",
+      "max": [
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+      "min": [
+        0.0
+      ]
+    }
+  ],
+  "buffers": [
+    {
+      "uri": "buffer.bin",
+      "byteLength": 33448
+    }
+  ],
+  "bufferViews": [
+    {
+      "buffer": 0,
+      "byteLength": 6180,
+      "byteStride": 12,
+      "target": 34962
+    },
+    {
+      "buffer": 0,
+      "byteOffset": 6180,
+      "byteLength": 6180,
+      "byteStride": 12,
+      "target": 34962
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+    {
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+    {
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+      "byteOffset": 28840,
+      "byteLength": 4608,
+      "target": 34963
+    }
+  ],
+  "images": [
+    {
+      "uri": "childFolder/texture/ChildFolder.jpg",
+      "name": "ChildFolder"
+    }
+  ],
+  "materials": [
+    {
+      "pbrMetallicRoughness": {
+        "baseColorTexture": {
+          "index": 0
+        },
+        "metallicFactor": 0.0,
+        "roughnessFactor": 0.5
+      },
+      "name": "ChildFolder"
+    }
+  ],
+  "meshes": [
+    {
+      "primitives": [
+        {
+          "attributes": {
+            "POSITION": 0,
+            "NORMAL": 1,
+            "TANGENT": 2,
+            "TEXCOORD_0": 3,
+            "TEXCOORD_1": 4
+          },
+          "indices": 5,
+          "material": 0
+        }
+      ],
+      "name": "RelativeResourcePaths"
+    }
+  ],
+  "nodes": [
+    {
+      "mesh": 0,
+      "name": "RelativeResourcePaths"
+    }
+  ],
+  "samplers": [
+    {
+      "minFilter": 9987
+    }
+  ],
+  "textures": [
+    {
+      "sampler": 0,
+      "source": 0,
+      "name": "ChildFolder 你好，世界"
+    }
+  ]
+}