Follow style guide and add linter configuration

[chtnnh]

There is no style guide being followed currently, which makes the code harder to read and maintain. I recommend adding a linter configuration to ensure beginners are introduced to code styling and formatting.

I recommend prettier or black

[chtnnh]

Willing to add the formatter and take care of the backlog!!

[rafaeelaudibert]

Hey @chtnnh. Thanks for reporting it, and I totally agree with you. However, I think we could leave this easier issue to someone else, as you are already tackling 2 other things, ok? LMK if you think otherwise.

[chtnnh]

Might be able to get it done quick, since hacktoberfest is ending, you know? LMK if that's cool