Add Game Engine Development (sindresorhus#2482)

readme.md

@@ -511,6 +511,7 @@
 - [Games of Coding](https://github.com/michelpereira/awesome-games-of-coding#readme) - Learn a programming language by making games.
 - [Esports](https://github.com/strift/awesome-esports#readme) - Video games played as a sport.
 - [Learn Gamedev](https://github.com/notpresident35/awesome-learn-gamedev#readme) - The craft of video game creation.
+- [Game Engine Development](https://github.com/stevinz/awesome-game-engine-dev#readme) - Building software to speed up game creation.
 - [GameMaker](https://github.com/bytecauldron/awesome-gamemaker#readme) - Game engine.
 - [Game Production](https://github.com/vhladiienko/awesome-game-production#readme) - Leading the process of designing, developing, testing and distributing a video game from concept to release.