Crtl+B & Ctrl+I & Ctrl+K keyboard shortcuts for text formatting via markdown

[bentuna]

Feature request

Which Nextcloud Version are you currently using: 32.0.6 / 31.0.14

Is your feature request related to a problem? Please describe.
It would be very helpful to be able to use keyboard shortcuts for markdown features in talk messages.

Describe the solution you'd like
I would like it to work like here in GitHub:
Select some text in the input field and press

• Ctrl+B to insert ** before and after the selection
• Ctrl+I to insert * before and after the selection
• Ctrl+K to insert [ before and ]() after the selection + set your cursor inside the ()