* adding package command
* add-package command name
* refactoring duplicate code
* fixed by review
* fixed by review
* remove-package command
* commands in different files, common utils
* fix add, remove, upgrade packages in 1 file
* copyright and downloadPath moved
* refactor
* downloadPath do no export
* adding/removing multiple packages
* addPackages/removePackages, comments, command-desc
* add-package, process case len(args) == 0
Co-authored-by: Francis Lavoie <lavofr@gmail.com>
