Add Xarray to the list

Author: sanketverma1704

conventions/index.md

@@ -20,6 +20,7 @@ Here are some of the conventions that are currently in use:<br>
 <li><a href="https://github.com/zarr-developers/geozarr-spec">GeoZarr</a></li>
 <li><a href="https://docs.unidata.ucar.edu/nug/current/nczarr_head.html">NCZarr</a></li>
 <li><a href="https://github.com/ome/ome-zarr-py">OME-Zarr</a></li>
+<li><a href="https://docs.xarray.dev/en/stable/internals/zarr-encoding-spec.html">Xarray</a></li>
 </ul>
 
 If you're working on/know a new convention and want to add it to the list, feel free