Can't get started with README.md instructions.

[blackketter]

Thought I'd give this a try, but following the README.md instructions, I get this error:

dean@lucky13 Downloads % git clone --recursive https://github.com/m5stack/CardputerZero-AppBuilder.git
Cloning into 'CardputerZero-AppBuilder'...
remote: Enumerating objects: 719, done.
remote: Counting objects: 100% (719/719), done.
remote: Compressing objects: 100% (484/484), done.
remote: Total 719 (delta 232), reused 662 (delta 186), pack-reused 0 (from 0)
Receiving objects: 100% (719/719), 4.69 MiB | 16.17 MiB/s, done.
Resolving deltas: 100% (232/232), done.
dean@lucky13 Downloads % cd CardputerZero-AppBuilder
dean@lucky13 CardputerZero-AppBuilder % git submodule update --init --recursive
dean@lucky13 CardputerZero-AppBuilder % cargo run -p czdev --release -- doctor
error: could not find `Cargo.toml` in `/Users/dean/Downloads/CardputerZero-AppBuilder` or any parent directory

Am I missing a step?