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

games/atomic_tanks.md

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+# Atomic Tanks
+
+_Scorched Earth clone similar to the Worms series._
+
+- Home: http://atanks.sourceforge.net/
+- State: mature, inactive since 2016 
+- Download: https://sourceforge.net/projects/atanks/files/
+- Platform: Windows, Linux
+- Keywords: action, artillery
+- Code repository: https://git.code.sf.net/p/atanks/atanks
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: Allegro
+
+## Building
+
+