Add Haxe Game Development (#1573)

Co-authored-by: Sindre Sorhus <sindresorhus@gmail.com>

readme.md

@@ -365,6 +365,7 @@
 - [Gideros](https://github.com/stetso/awesome-gideros#readme) - Game engine.
 - [Minecraft](https://github.com/bs-community/awesome-minecraft#readme) - Sandbox video game.
 - [Game Datasets](https://github.com/leomaurodesenv/game-datasets#readme) - Materials and datasets for Artificial Intelligence in games.
+- [Haxe Game Development](https://github.com/Dvergar/awesome-haxe-gamedev#readme) - A high-level strongly typed programming language used to produce cross-platform native code.
 - [libGDX](https://github.com/rafaskb/awesome-libgdx#readme) - Java game framework.