Add pSynchronicity project page

[BradleyA-K]

Real-time group synchrony-feedback prototype built with goofi-pipe for BrainHack School 2026.

Closes # .

Changes proposed in this pull request:

• Adds my BrainHack School 2026 project page: pSynchronicity - a real-time group synchronisation- feedback prototype built with goof-pipe. Folder: content/en/project/groovy-psync

[BradleyA-K]

@lunebellec Here is the project :) !

[lunebellec]

The project report LGTM but (1) the repo it points to is private. This is fine if that's what you want, but it reduces value for future brainhackers who may want to build on your work, or be inspired by your project organization; (2) the repo currently does not have any code assets, so it's impossible to judge what was done beyond the demo done in class.