[FEATURE] Recipes for R-based packages from Github

[mari-ga]

Is your feature request related to a problem? Please describe.
Hi,
First of all, thank you very much for this tool.
I've been trying to create a recipe for an R-based package (CellhashR - https://github.com/BimberLab/cellhashR). The problem is that, in this case, the package is not hosted in Cran; it is only available on GitHub.

Describe the solution you'd like
So, my question is, is it possible to generate recipes for R packages hosted on GitHub? I know it is already possible for Python packages.

Describe alternatives you've considered
I have been trying to create the recipes on my own, but I'm still struggling with some errors related to the build.sh file.

Thank you very much in advance!