There's a bit more info in the repo README, proper docs and more of the expected functionality coming soon.
About
Acknowledgements
I used a very old Turtle editor as a starter for Atuin. I'd saved it for later...later was much later. The core design - and logo - of Atuin is essentially the same (totally reimplemented under the hood), except the earlier app also had a GitHub connector. But I have absolutely no clue who build the original. If anyone knows, please let me know so I can give them credit.