Add Hand Driver Demo sample

package.json

@@ -8,5 +8,12 @@
     "name": "Udexreal"
   },
 "dependencies": {
+  },
+  "samples": [
+    {
+      "displayName": "Hand Driver Demo",
+      "description": "Example scene for Hand Driver.",
+      "path": "Samples~/Hand Driver Demo"
     }
+  ]
 }