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

entries/arx_libertatis.md

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+# Arx Libertatis
+
+_Arx Libertatis is a cross-platform, open source port of Arx Fatalis, a 2002 first-person role-playing game / dungeon crawler._
+
+- Home: http://arx-libertatis.org/
+- Media: https://en.wikipedia.org/wiki/Arx_Fatalis#Development
+- State: mature
+- Download: http://wiki.arx-libertatis.org/Download
+- Keywords: role playing, inspired by Arx Fatalis, remake, singleplayer
+- Code repository: https://github.com/arx/ArxLibertatis.git
+- Code language: C++
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: CMake
+