Suggestion: Indicate which projects have available source code

[KaranocaVe]

Hello,

Thank you for maintaining this excellent repository of WinUI 3 applications. It serves as a valuable resource for developers and learners interested in exploring and building with WinUI 3.

I have a suggestion that could make the repository even more helpful for the community: could you please add an indication for each project to specify whether its source code is publicly available? For example, a simple label like "Source Code Available" or a direct link to the source repository (if applicable) would be greatly appreciated.

This addition would help learners and developers quickly identify projects with accessible source code, making it easier to learn from real-world examples and contribute to the ecosystem.

Thank you for considering this suggestion, and I appreciate your efforts in curating this repository.