imports from libregamewiki, conversions cvs to git, correcting keywords and code dependencies

entries/sdl-ball.md

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+# SDL-Ball
+
+_Arcade breakout-like game._
+
+- Home: http://sdl-ball.sourceforge.net/, https://sourceforge.net/projects/sdl-ball/
+- State: mature, inactive since 2016
+- Download: http://sdl-ball.sourceforge.net/?page=download, https://sourceforge.net/projects/sdl-ball/files/
+- Platform: Linux
+- Keywords: arcade, breakout-like, open content
+- Code repository: https://github.com/DusteDdk/SDL-Ball.git
+- Code language: C++
+- Code license: GPL-3.0
+- Code dependencies: OpenGL, SDL
+- Assets license: ? (GPL)
+
+Developer: Jimmy Christensen
+
+## Building
+
+- Build system: Make