Add Pomodoro timer/easier timer to use

I think the only way to add a timer now is to create a start time and and end time, and that's after you enable a couple of buttons, too.

That seems too slow. Plus, I'd like something a bit more Pomodoro style, and to be enabled for each chosen task with 1-2 clicks.

A Pomodoro app you might want to check out for inspiration is this: https://pomofocus.io/ - I don't want something exactly like that as that's a standalone app, but just look how nice/easy it is to use UX-wise.