Add Screen Break

Hi, I'd like to suggest adding Screen Break to the desktop app list.

• App: Screen Break
• Website: https://screen-break-mac.netlify.app/
• Platforms: macOS
• Pricing: Free
• Suggested category: Utility

Suggested README entry:

- [Screen Break](https://screen-break-mac.netlify.app/) - macOS menu bar break reminder with guided full-screen rests, idle reset, and busy auto-defer. 

Screen Break is a free macOS menu bar break reminder that helps people take real breaks with guided full-screen rests. It also supports idle reset and busy auto-defer for meetings, media, games, or presentations.