Add any GNU core utility rewritten in Rust

[Venoox]

You can add any GNU utility to this repo. It doesn't need to support all flags, just basic functionality.
List of them here: https://en.wikipedia.org/wiki/List_of_GNU_Core_Utilities_commands
You can find source code in C here: https://github.com/coreutils/coreutils

[Johann150]

Maybe you should have a look at https://gitlab.redox-os.org/redox-os/uutils