Add README and GPL-3.0-or-later license

Professional README with badges, architecture diagram, tool reference,
device specs, fuzz results, and quick start guide. GPL-3.0 aligns with
the Linux kernel ecosystem (uvcvideo, v4l2loopback).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: copyleftdev

Cargo.toml

@@ -15,7 +15,7 @@ exclude = [
 [workspace.package]
 version = "0.1.0"
 edition = "2021"
-license = "MIT"
+license = "GPL-3.0-or-later"
 authors = ["Facecam Ubuntu Runtime"]
 
 [workspace.dependencies]