[FEATURE REQUEST] Add week number to the calendar view

Hello

First of all, thanks for the amazing application. I recently started to use it to support my new "shift based" job.

One of the feature that imho should be added to the app, it's the possibility to view within the calendar screen the week number. I receive my schedule on a weekly basis, and I continuously check the week-date before adding my shift to the app.

Best Regards