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

games/ufo2000.md

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+# UFO2000
+
+_Free and open source turn based tactical squad simulation multiplayer game._
+
+- Home: http://ufo2000.sourceforge.net/
+- State: mature, inactive since 2012
+- Download: (see home)
+- Keywords: strategy
+- Code repository: https://github.com/ufo2000/ufo2000.git (mirror of svn), https://svn.code.sf.net/p/ufo2000/code/ (svn)
+- Code language: C++
+- Code license: GPL-2.0
+
+## Building
+