User can add/edit scorecards for a player in a game

On the game page, the user should see a table of everyone's scores.

On the horizontal axis should be player's names.

On the vertical axis should be the rounds.

On the center bottom of this page should be a button to add new scores ("Add Round").

This will then trigger a modal with complex functionality.

This modal is a full calculator (so build a calculator component).

It should have buttons for each number input since this app is mobile first. It should have operations for addition, subtraction, multiplication, and division along with backspace. It should also have an "OK" button to exit out of the modal (giving the player the current visible score), or "enter" which moves to the next person.

This same modal should be used when editing a player's score (happens when clicking on their cell).

Keep in mind good principles when building mobile first UI such as buttons being at least 40px x 40px.