Description
The alejandra crate published on crates.io is just the library. The command line utility is not included. It can be seen on the docs.rs page for the crate, on the Sources tab: https://docs.rs/crate/alejandra/3.1.0/source/
The sources correspond to the src/alejandra directory in this repository. By the way, that's why README.md is missing - it's missing from that directory.
That's also why I cannot use cargo to install alejandra:
$ cargo install alejandra
Updating crates.io index
error: there is nothing to install in `alejandra v3.1.0`, because it has no binaries
`cargo install` is only for installing programs, and can't be used with libraries.
To use a library crate, add it as a dependency to a Cargo project with `cargo add`.
The simplest fix would be to publish the alejandra_cli crate. This approach is taken e.g. by taplo, the TOML formatter.
Another approach would be to add CLI to the alejandra crate, i.e. merge alejandra_cli into alejandra. That would be more user-friendly. This approach is taken by most crates that provide binaries, e.g. rpigrep, fd-find, stylua, stgit to name a few.