Add briq in the list of projects built / deployed on StarkNet

I've added the briq repo in the list of projects Built / Deployed on StarkNet.

Checklist

[x] The URL is not already present in the list (check with CTRL/CMD+F in the raw markdown file).
[x] Each description starts with an uppercase character and ends with a period.
Example: cairo - The Cairo programming language.
[x] Drop all A / An prefixes at the start of the description.
[x] Avoid using the word StarkNet in the description.