It is likely that you want to use create_project() or create_package()
instead of use_rstudio()! Both create_*() functions can add RStudio
Project infrastructure to a pre-existing project or package. use_rstudio()
is mostly for internal use or for those creating a usethis-like package for
their organization. It does the following in the current project, often after
executing proj_set(..., force = TRUE):
Creates an .Rproj file
Adds RStudio files to .gitignore
Adds RStudio files to .Rbuildignore, if project is a package
use_rstudio(line_ending = c("posix", "windows"))Line ending