renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/ioquake3.md

@@ -0,0 +1,19 @@
+# ioquake3
+
+_Remake of Quake 3._
+
+- Home: http://ioquake3.org/
+- State: mature
+- Download: https://ioquake3.org/get-it/
+- Platform: Windows, Linux, macOS
+- Keywords: action, game engine, inspired by Quake 3, remake, requires original content, shooter
+- Code repository: https://github.com/ioquake/ioq3.git
+- Code language: C
+- Code license: GPL-2.0
+- Code dependencies: SDL2
+
+[Derivative games](https://ioquake3.org/extras/derivative-games/)
+
+## Building
+
+- Build system: Make