Add laps with physical button

[superpupervlad]

Is your feature request related to a problem? Please describe. Sometimes it is much easier to press volume down/up button on phone to set a new lap than unlock phone and press lap button on screen.

Describe the solution you'd like I want a setting to choose physical button e.g. volume buttons to set new laps in stopwatch.

Describe alternatives you've considered It may be not the physical button but the action that will trigger new lap creation. The app will track volume level and if it was reduced via headphones it will add lap anyway.