Add History

[quadroli]

Is your feature request related to a problem? Please describe.

It would be nice if one could have history of at least the last 5 calculations, sometimes people like to go back to a calculation they did or, this opens the possibility to use the calculator for briefly and quickly saving a number

Describe the solution you'd like

Add the ability to remember at least the last 5 previously done calculations, preferrably having them retained between sessions

Describe alternatives you've considered

Possibly saving the calculation in a note taking app if I may need it later