Please read the vignette.
Or, after installation, the help page:
#> Helps Me Create, Build and Maintain Packages
#>
#> Description:
#>
#> Helper functions for package creation, building and maintenance,
#> heavily borrowing from 'devtools' 1.13.3.
#>
#> Details:
#>
#> You will find the details in
#> 'vignette("An_Introduction_to_packager", package = "packager")'.
You can install packager from gitlab via: