feat: added :ProjectAddManually to add undetected projects manually.

[Alex23rodriguez]

[alloc33]

Yes, sometimes it doesn't recognize projects some reason, have to open/close one project 5-6 tines so it will be recognized

[porl]

Whilst this works as-is (with @ebkalderon 's typo fix) it feels a bit clunky to me. It is fine for a work-around but since this is being added to the project itself I don't think we should be running external commands to manually update a history file.

The idea of adding the current file's directory to the project list is useful though, and I think another option for adding the current work directory would be useful too.