config: Add three.js to OSS Game Engines

[zalo]

If raylib and the other WebGL and graphics library abstractions count, then three.js certainly counts!

It’s easily the most popular game engine (and 3D abstraction) on the web. 😄

[634750802]

The three.js library is a general-purpose tool for graphic rendering and is not specifically designed to function as a game engine. A game engine typically offers a broader range of features beyond graphic rendering.

[zalo]

three.js does much more than just graphic rendering

A few comparisons to Raylib (the most rapidly growing “game engine” on the current list):

• three.js offers a well developed scene hierarchy abstraction, while Raylib is just a series of graphics and input API abstractions with no scene hierarchy.
• three.js’s suite of features vastly eclipses Raylib’s (and most of the other engines on the list) because its examples are composed of reusable engine components (that are distributed with and meant to be used from the base npm package)): https://threejs.org/examples/

This is bolstered by the fact that these engine components (including skinning, lighting, nodes, physics, VR/AR etc.) can be found in its release changelist: https://github.com/mrdoob/three.js/releases/