Add start/stop timer button

[nk-dev0]

This repo is great and very close to what I'd be looking for. The only thing I can think to add is just a big button on the screen to start a timer and create a record of an action. Maybe you can change the action type before clicking the button. This is especially useful if you're starting an activity but not wanting to click all of these fine details (e.g. recording commute times: in the car you don't have the time to focus on setting everything up).

I'm an experienced data scientist but brand new to UI/react/etc. and can probably figure it out eventually in a PR, but how hard do you think this would be?

[TommyX12]

Hi there, thanks for the great suggestion. Other people have proposed this as well; I will consider implementing it.