Add Karafuru to the list of tools

[yefga]

Added Karafuru as a new color assistant tool.

0. I have read the Contribution Guidelines
1. Project URL: https://apps.apple.com/app/karafuru/id6757244075
2. Why should this project be added: help you understand color instantly, by point, or type.
3. End all descriptions with a full stop/period
4. Entry is ordered alphabetically
5. Appropriate icon(s) added if applicable (OSS, freeware)