Add kingroon filament brand#576

I always use kingroon filament and I was sad to see that it was not a choice in the app.

Can you add it as an option? Here’s a link: https://kingroon.com/?sca_ref=8527843.6JDaFW7SuF&gad_source=1&gad_campaignid=23385438871&gbraid=0AAAABCXZgciDhk7F76jNCUGzrb-LAWPEd&gclid=CjwKCAiA95fLBhBPEiwATXUsxHtBhgU9cafOTxEMvG5eEgPf5imiU_2j93AYQIZ25tEhTAxk4nFqORoCcOAQAvD_BwE

Hi there :)

We rely on users to help us add new filaments to the database. You can see how to do that here: https://github.com/SimplyPrint/open-filament-database/