Add an option for a 00 key

[Vonzedlitz]

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

Maybe add a separate 00 key or have 00 available after a long press on the 0 key - when pressed it generates two zeros on the screen, much like pressing any other number works. So, for example, you would press the 1 key and the 00 key to see 100 displayed in the calculator window.

Why do you want this feature?

It can be useful when tapping in larger numbers because less key presses are needed.

It's also a feature that not many Android calculators have so as well as being useful to some people, it will also help your calculator stand out from the busy crowd of Android calculators.

Additional information

I guess not everybody would want this function so perhaps make it an option that can be toggled on/off from the settings ?