Using devtools to host code from GitHub can be done using the following steps:

1. Add some useful metadata and license files to the package:

usethis::use_mit_license(name = "Dan MacLean")
usethis::use_readme_rmd()
usethis::use_lifecycle_badge("Experimental")
usethis::use_version()

2. Add to the list of dependencies that will be automatically installed when your package is installed:

usethis::use_package("ggplot2")

3. Automatically set up the local Git repository and get GitHub credentials:

usethis::use_git()
usethis::browse_github_token() 
usethis::use_github()

4. Install the package from GitHub:

devtools::install_github("user/repo")