I have just done the bare minimum to get it working. Hopefully it can be useful for some of you.
Here you have some basic [documentation]([https://mantielero.github.io/gr.nim/](https://mantielero.github.io/gr.nim/)) and the [code]([https://github.com/mantielero/gr.nim)](https://github.com/mantielero/gr.nim\)).
