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

games/ballerburg.md

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+# Ballerburg
+
+_Turnbased Artillery game from 1987._
+
+- Home: http://www.eckhardkruse.net/atari_st/baller.html
+- Media: https://en.wikipedia.org/wiki/Ballerburg
+- State: mature, inactive since 1987 
+- Keywords: action, artillery
+- Code repository: (see download)
+- Code language: C
+- Code license: Public Domain
+
+See also [Ballerburg SDL](http://baller.tuxfamily.org/)
+
+## Building
+