Web Calculator

09/04/2019: Initated web calculator project & respository on Github
10/04/2019: Successfully get calculator to work all functions via tutorial video, now my imagination must lead the rest of the way
20/10/2019: Restarting project via new branch 'Redo-21-10-2019' for fresher perspective'
21/10/2019: Completed calculator with all four functions (add, subract, multiply delete) to work
22/10/2019: Numeral buttons are working on branch 'numeral-buttons-22-10-2019', appears it doesn't on textboxes considering they're inputs. But does work on header (h2), this would be the 'textbox' from now one