Fix shard cli

[Rdornier]

Hello @sbesson @melissalinkert ,

I was trying out the tool during the OME-NGFF hackathon and would like to fix

• --shard argument : it is expected to be uppercase in the code but in the description, it is written lowercase. I simply added shard.toUpperCase() to fix it.
• README : Added installation and usage instructions a bit more precisely.

Hope it'll help,
Rémy.

[sbesson]

Thanks for the contributions @Rdornier.

This repository was initially created in the context of the OME 2024 NGFF challenge to consume and assess the zarr-java library to produce Zarr v3 datasets in the Java ecosystem.

At the moment, we have no plan to supporting this project as a standalone library. Instead, our next steps will be to update https://github.com/glencoesoftware/bioformats2raw and https://github.com/glencoesoftware/raw2ometiff to write and read OME-Zarr datasets using the 0.5 version of the specification. Given the time of the year, this body of work will probably happen early 2025.

I am going to close this as well as #7. If we decide there is value in this tool, we can always reopen this PR at a later date.

[Rdornier]

Ok, thanks for the info @sbesson 👍