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

entries/zero_ballistics.md

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+# Zero Ballistics
+
+_Zero Ballistics is a unique blend of first person shooter and tank combat, focusing on multiplayer gaming exclusively._
+
+- Home: http://www.zeroballistics.com/, https://sourceforge.net/projects/zeroballistics/
+- State: mature, inactive since 2013
+- Download: https://sourceforge.net/projects/zeroballistics/files/
+- Platform: Windows
+- Keywords: strategy
+- Code repository: https://gitlab.com/osgames/zeroballistics.git (mirror), https://sourceforge.net/p/zeroballistics/code/HEAD/tree/ (svn)
+- Code language: C++
+- Code license: MIT
+
+## Building
+
+- Build system: CMake