Add JS example

[martindurant]

https://observablehq.com/@manzt/ome-tiff-as-filesystemreference

@manzt , perhaps you want to comment on the status of your zarr storage driver.

[manzt]

Sorry for the delay on response. I'll look into updating this example with the library I've written (and updated reference): https://github.com/manzt/reference-spec-reader

[martindurant]

That's great! I hope others will use it too.