renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/atomic_tanks.md

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+# Atomic Tanks
+
+_Scorched Earth clone similar to the Worms series._
+
+- Home: http://atanks.sourceforge.net/, https://sourceforge.net/projects/atanks
+- State: mature, inactive since 2016 
+- Download: https://sourceforge.net/projects/atanks/files/
+- Platform: Windows, Linux
+- Keywords: action, artillery, inspired by Scorched Earth, open content, remake, wormslike
+- Code repository: https://git.code.sf.net/p/atanks/atanks, https://gitlab.com/osgames/atanks.git (+)
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: Allegro
+- Assets license: GPL
+
+Developer: Jesse Smith, Juraj Michalek, Thomas Hudson
+
+## Building
+
+