Add a repo description

[Mr0grog]

We’re trying to make sure every repo has a description (see ipfs-inactive/docs#55) and this repo is missing one. I don’t have permissions to add it, but I’d suggest something like:

Command-line tool for convert a datastore (e.g. from FlatFS to Badger)

[magik6k]

Done

[Mr0grog]

Thanks! 🎉