Add icon key-value pair

topics/game-development/index.md

@@ -3,6 +3,7 @@ aliases: game-development, game-dev
 display_name: Game Development
 short_description: Game Development is the art of creating games and describes the design, development and release of a game.
 topic: game-development
+icon: game-development.png
 wikipedia_url: https://en.wikipedia.org/wiki/Video_game_development
 ---
 Video game developers take a designer's concepts and build them into a playable game for users. Video game developers, also known as games developers or video game programmers, write code for games for a variety of formats, such as PCs, consoles, web browsers and mobile phones.