Reminders hit on specific days of the week

### Problem

I wanted to create a schedule using this app. Some tasks I need to do multiple times a week (e.g. Monday, Thursday, Friday) in the same time. However, to do this, I would have to create 3! reminders with the same name.

### Proposal

Take an example from [Reminders App by Sasha Hale](https://flathub.org/ru/apps/io.github.dgsasha.Remembrance). When you click "repeat a reminder every week", a popup with days of the week appear. You click the ones that you want, and now, each week on selected days, this reminder occurs. (Sadly the app itself is bugged and after I've scheduled all the reminders, booted off the computer and then woke up the next day, the app just crashes due to a timeout exception, buuuut that's a discussion for another day 😅)

### Prior Art (Optional)

_No response_