Add watch example to index.html

Author: dmarcos

examples/index.html

@@ -157,6 +157,7 @@ <h2>Examples</h2>
       <li><a href="boilerplate/3d-model/">3D Model (glTF)</a></li>
       <li><a href="mixed-reality/anchor/">Anchor (Mixed Reality)</a></li>
       <li><a href="mixed-reality/real-world-meshing/">Real World Meshing (Mixed Reality)</a></li>
+      <li><a href="mixed-reality/watch/">Virtual Watch (Mixed Reality)</a></li>
       <li><a href="boilerplate/importmap/">Importmap (import teapot geometry from three/addons)</a></li>
       <li><a href="showcase/webgpu/">WebGPU renderer and TSL</a></li>
       <li><a href="showcase/post-processing/">Post-Processing</a></li>