Calculator program for Kivy

Calculator app made using Kivy. Right now, it only supports the very basic operations. Shows popup whenever error occurs.

Problems:

• As it uses Config.set('graphics', 'resizable', '0'), it is not resizable, and unless this setting is changed before another kivy app is run, that app will also not resize.
• Has a set resolution. This will be fixed, and should also fix the problem above.
• The textinput is disabled, so operations can only be inputted through clicking on tiles. It is possible to only allow certain inputs in a textinput, so this is something that can be fixed as well.
• Only supports basic operations. A future feature might be resizing to a scientific calculator, like the inbuilt Mac calculator.