Add json examples for material and asset files

.github/workflows/validate-json.yaml

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+# Validate JSON schema files
+# Source: https://github.com/nhalstead/validate-json-action
+# Forked from: https://github.com/marketplace/actions/validate-json
+name: Validate JSON schemas for assets and materials
+
+on: 
+  push:
+    branches: [ main ]
+
+jobs:
+  json-schema-validation:
+    name: JSON schema validation
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v1
+
+      - name: Validate "asset" JSON schemas
+        uses: nhalstead/[email protected]
+        with:
+          schema: ./schemas/asset_schema.json
+          jsons: ./examples/*_asset.xoma
+
+      - name: Validate "material" JSON schemas
+        uses: nhalstead/[email protected]
+        with:
+          schema: ./schemas/material_schema.json
+          jsons: ./examples/*_material.xomp
+

examples/example_asset.xoma

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+{
+  "metadata": {
+    "copyright" : "(C) 2023-2024, Example Company",
+    "generator": "Blender",
+    "openmaterial_version": "1.0.0",
+    "creator": "Example Company",
+    "creation_date": "20240703T101728Z",
+    "asset_version": "1.0.0",
+    "id": "87769375a5109c689af8cc3ad3dd8349",
+    "name": "example_car",
+    "label": "vehicle",
+    "description": "Example car to demonstrate how OpenMATERIAL works"
+  },
+  "material_mapping": [
+    ["10;50;255;127", "example_material.xomp"]
+  ]
+}