Adding time to a running timer

[xXNickznXx]

Checklist

• [x] I made sure that there are no existing issues - open or closed - to which I could contribute my information.
• [x] I made sure that there are no existing discussions - open or closed - to which I could contribute my information.
• [x] I have read the FAQs inside the app (Menu -> About -> FAQs) and my problem isn't listed.
• [x] I have taken the time to fill in all the required details. I understand that the request will be dismissed otherwise.
• [x] This issue contains only one feature request.
• [x] I have read and understood the contribution guidelines.

Feature description

I previously used the google clock app which offers the ability to add an extra minute to a currently running timer.

Why do you want this feature?

This is useful because you don't have to set a timer for every single minute. Instead, I setup some presets, for exampe 05:00, 10:00, etc, but if I need a 08:00 timer only once, I just start the 05:00 timer and press the +1:00 button three times.

Additional information

Similar Issue: https://github.com/FossifyOrg/Clock/issues/262