Adding contributors list to `README.md` for various repositories under zarr-developers

[sanketverma1704]

Hi all. 👋🏻

Linking this from zarr-developers/zarr-python#804. I did a little snooping and found that we can list contributors of zarr-python, numcodecs, zarr-specs and other repositories using all-contributors. Thanks to @Saransh-cpp for mentioning this in zarr-developers/zarr-python#1185. The contributors' list will be shown in the README.md and will look something like this.

The usage of this bot is fairly simple, which can be seen here.

I also asked about having something like this during the community meeting on 02/22, and everyone was in favour.

Please let me know your thoughts. Thanks!
CC: @zarr-developers/python-core-devs @zarr-developers/steering-council

[joshmoore]

Sounds great to me. ❤️ for contributors!

If anyone has any objections, please speak up soon!

[sanketverma1704]

Thanks, everyone, for the 👍🏻 and 🚀. It seems like there's no objection to this.
I've requested to install the all-contributors bot to the zarr-python, numcodecs, zarr-specs and blog repository. Please have a look, @joshmoore.

[joshmoore]

Yup, got the notification and activated.