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

games/gltron.md

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+# GLtron
+
+_3D snake game based on the light cycle portion of the film Tron._
+
+- Home: http://www.gltron.org/, https://sourceforge.net/projects/gltron/
+- Media: https://en.wikipedia.org/wiki/GLtron
+- State: beta, inactive since 2016
+- Download: http://www.gltron.org/download.php
+- Platform: Windows, Linux, macOS
+- Keywords: action, snake-like
+- Code repository: https://git.code.sf.net/p/gltron/git, https://svn.code.sf.net/p/gltron/code (svn), http://gltron.cvs.sourceforge.net (cvs)
+- Code language: C
+- Code license: GPL
+- Code dependencies: SDL
+
+## Building
+