QR Code Component Card Built with HTML and CSS

Hi, thanks for looking. My question with this project is mainly about setting up the files and what is appropriate to include in the GitHub repo? For example I ended up adding all my files after downloading and now I have design files in there. Should I delete those to keep the repo cleaner? Or is it helpful to have them there? Also, for a small project like this is it appropriate to have a separate css file with a normalize file included? Thanks so much!