99de2a93da
This adds a workflow for [R packages](https://www.r-project.org/). It uses a [setup-r](https://github.com/r-lib/actions/tree/master/setup-r) action and two R packages - [remotes](https://remotes.r-lib.org/) - to install the R package dependencies - [rcmdcheck](https://github.com/r-lib/rcmdcheck) - to run and format the output of the package checking tool used in the R ecosystem.