git config

at the cli level it would be great to have "git config" for introspection.

https://github.com/go-git/go-git/blob/main/_examples/config/main.go show that its there...

The command structure could imitate the gnu git cli like :

```sh
config --get user.name

config --set user.name

config --get remote.origin.url

etc

```

--path is useful also to tell the git command what path to use etc.


