moved the entries up one folder, added the folder to the keywords

games/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
+- Download: http://xu4.sourceforge.net/download.php
+- Keywords: rpg, SP
+- 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