Create USERS.md (#687)

This is an initial version of a list of known projects that are using meshoptimizer. It's missing a lot of projects I've been told about and don't remember OTOH, and it's likely missing a *lot* of games that use it that I don't know about.

The intent here is to slowly expand this list over time with prominent projects (commercial software or open source software).

USERS.md

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+meshoptimizer is widely used in the games industry as well as in many pipelines for processing 3D content for real-time rendering. This document contains a small selection of projects that rely on meshoptimizer.
+
+For brevity, the projects listed below are limited to commercial software or open source software that has 100+ stars on GitHub. Please feel free to contribute additions via pull requests.
+
+# Games
+
+If you are shipping a game that is using meshoptimizer, listing the library in the credits or documentation would be appreciated!
+
+- [Alan Wake 2 (2023)](https://www.remedygames.com/games/alan-wake-2)
+- [Baldur's Gate 3 (2023)](https://baldursgate3.game/)
+- [Cities: Skylines II (2023)](https://www.paradoxinteractive.com/games/cities-skylines-ii/about)
+- [Counter-Strike 2 (2023)](https://www.counter-strike.net/cs2)
+- [Jagged Alliance 3 (2023)](https://jaggedalliance3.thqnordic.com/)
+- [The Legend of Zelda: Tears of the Kingdom (2023)](https://zelda.nintendo.com/tears-of-the-kingdom/)
+- [Manifold Garden (2019)](https://manifold.garden)
+- [Monaco 2](https://store.steampowered.com/app/1063030/Monaco_2/)
+- [Ravenswatch (2023)](https://store.steampowered.com/app/2071280/Ravenswatch/)
+- [The Settlers: New Allies (2023)](https://www.ubisoft.com/en-us/game/the-settlers/new-allies)
+- [Stranded: Alien Dawn (2023)](https://www.strandedaliendawn.com/en-US)
+- [Tunnet (2023)](https://store.steampowered.com/app/2286390/Tunnet/)
+
+# Engines
+
+If you are shipping an engine that is using meshoptimizer, listing the library in the documentation would be appreciated!
+
+- [Bevy](https://bevyengine.org/)
+- [The Forge](https://theforge.dev/)
+- [Godot](https://godotengine.org/)
+- [HypeHype](https://hypehype.com/en)
+- [Roblox](https://www.roblox.com/)
+- [Unigine](https://unigine.com/)
+- [Wonderland Engine](https://wonderlandengine.com/)
+
+meshoptimizer is also used in [Waymo](https://waymo.com/) internal stack.
+
+# Web
+
+meshoptimizer supports various web projects through [meshoptimizer.js](https://www.npmjs.com/package/meshoptimizer).
+For projects in the glTF ecosystem, [gltfpack](https://github.com/zeux/meshoptimizer/tree/master/gltf#-gltfpack) is developed alongside meshoptimizer, and `EXT_meshopt_compression` glTF extension is implemented by meshoptimizer.js.
+
+This list contains a small selection of popular projects in the web ecosystem that use meshoptimizer; see also [a list of projects that depend on meshoptimizer through NPM](https://github.com/zeux/meshoptimizer/network/dependents).
+
+- [Babylon.js](https://www.babylonjs.com/)
+- [CesiumJS](https://cesium.com/platform/cesiumjs/)
+- [three.js](https://threejs.org/)