Add IconsDataSchema (#1634)

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## Description
Same as #1630 

## Motivation and Context
<!--- Why is this change required? What problem does it solve? -->
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## How Has This Been Tested?
Manual

## Screenshots (if appropriate):

## Types of changes
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the boxes that apply: -->
- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to change)

WinUIGallery/DataModel/IconsDataSchema.json

@@ -0,0 +1,28 @@
+{
+    "$schema": "http://json-schema.org/draft-04/schema#",
+    "type": "array",
+    "items": {
+        "type": "object",
+        "properties": {
+            "Code": {
+                "type": "string",
+                "description": "Glyph code",
+                "uniqueItems": true
+            },
+            "Name": {
+                "type": "string",
+                "description": "Name of the glyph",
+                "uniqueItems": true
+            },
+            "Tags": {
+                "type": "array",
+                "description": "Array of tags related to this glyph",
+                "uniqueItems": true,
+                "items": {
+                    "type": "string"
+                }
+            }
+        },
+        "required": ["Code", "Name"]
+    }
+}