Add [classicQ](https://github.com/classicq/classicq)

[mg0x7BE]

Please add classicQ to the Quake 1 section.

• Source repo: https://github.com/classicq/classicq
• Official website: https://classicq.github.io/
• License: GPL-2.0

Classic-feel QuakeWorld client forked from Fodquake, released for Quake's 30th anniversary, rendering through SDL3's SDL_GPU API. Native builds for Windows, Linux and macOS.