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

entries/xonotic.md

@@ -0,0 +1,15 @@
+# Xonotic
+
+_Arena-style first person shooter._
+
+- Home: http://www.xonotic.org/
+- Media: https://en.wikipedia.org/wiki/Xonotic
+- State: mature
+- Download: http://www.xonotic.org/download/
+- Keywords: action, shooter
+- Code repository: https://gitlab.com/xonotic/xonotic.git, https://gitlab.com/xonotic/xonotic-data.pk3dir.git
+- Code language: C
+- Code license: GPL-3.0 (Darkplace engine is GPL-2.0)
+
+## Building
+