docs: add demo GIF to README

- cortex_demo.gif: 400px, 10fps, palette-optimized (833KB) - Converted from cortex.mp4 (3.8s, 1280x720, 30fps) - Shows physics simulation with PBR + shadows + multi-light - README.md: embedded GIF at top - .gitignore: added cortex.mp4 (source video, too large for git)
2026-06-19 17:21:40 +03:00
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 AI-Native 3D game engine with pure P/Invoke Vulkan 1.3 render backend.

+![Cortex Engine Demo](cortex_demo.gif)
+
 ## Features

 - **Vulkan 1.3** — dynamic rendering, synchronization2, pure P/Invoke (no wrapper libraries)