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

entries/ballerburg_sdl.md

@@ -0,0 +1,20 @@
+# Ballerburg SDL
+
+_Remake of the Turnbased Artillery game from 1987._
+
+- Home: https://baller.tuxfamily.org/
+- Media: https://en.wikipedia.org/wiki/Ballerburg
+- State: mature
+- Keywords: action, artillery, inspired by Ballerburg
+- Code repository: https://git.tuxfamily.org/baller/baller.git, https://gitlab.com/osgames/ballerburg.git (+) (import of original source downloads)
+- Code language: C
+- Code license: GPL-3.0
+- Code dependencies: SDL2
+
+[Original](http://www.eckhardkruse.net/atari_st/baller.html) in the Public domain.
+
+
+## Building
+
+- Build system: CMake
+