Add prettier config file

[brunolm]

Prettier is a program that automatically formats your code.

Here is the VSCode extension: https://marketplace.visualstudio.com/items?itemName=esbenp.prettier-vscode

[brunolm]

Before vs After

NOTE: you have like 3 errors and it won't format if it has errors (you're not closing main, you have center being closed in wrong places, etc)