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

entries/xu4.md

@@ -0,0 +1,18 @@
+# xu4
+
+_A remake of the computer game Ultima IV._
+
+- Home: http://xu4.sourceforge.net/, https://sourceforge.net/projects/xu4/
+- Media: <https://en.wikipedia.org/wiki/Ultima_IV:_Quest_of_the_Avatar#Ultima_IV_on_modern_operating_systems>
+- State: mature, inactive since 2016
+- Download: http://xu4.sourceforge.net/download.php
+- Keywords: role playing, inspired by Ultima IV, remake, singleplayer
+- Code repository: https://svn.code.sf.net/p/xu4/code/ (svn)
+- Code language: C++
+- Code license: GPL-2.0
+
+Ultima 4 is now [freely available](https://www.gog.com/game/ultima_4).
+
+## Building
+
+- Build system: CMake