Shortcut to toggle Focus Mode

SUMMARY (your need in one sentence)

As a user I want to hit a keyboard shortcut so that Foucus Mode is toggled

GIVE US CONTEXT (tell us about the current experience)
I think it’s a bit cumbersome to press the tiny button at the bottom of the left menu to activate Focus Mode

PROVIDE DETAILS (tell us what you are looking to change)

I’d like some keyboard shortcuts to toggle Focus Mode, and possibly selecting for how long