Is your feature request related to a problem? Please describe.
On macOS and Linux, directories starting with a dot (.) are hidden by default.
However, on Windows, we need to set additional attributes to achieve the same behavior.
To maintain consistency across platforms, we now hide the .jj directory on Windows as well.

Describe the solution you'd like
Just call Windows API

Describe alternatives you've considered
After creating the '.jj 'directory, manually hide it in a Command