add private file

[givetimetolife]

add private file

[mig42]

Hi, the command implementation looks good at a first glance, though there are a few linting issues to fix. We'd need some tests to ensure that it doesn't break in the future, too.

Additionally, the proposal is to add the Add command to all items in the changes list. That should only apply to private items, as is the intention of the PR and the expected usage of the command. The problem is, the status refresh only returns items under version control currently, because we didn't have the add functionality. So we'd have to sort that before moving forward.