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

entries/sandbox_game_maker.md

@@ -0,0 +1,14 @@
+# sandbox Game Maker
+
+_Open source easy to use standalone 3D Game Maker and 3D Game Design program currently based on the cube 2 engine._
+
+- Home: http://www.sandboxgamemaker.com/free-game-maker/
+- State: mature, inactive since 2014
+- Download: http://www.sandboxgamemaker.com/free-game-maker-download/
+- Keywords: framework
+- Code repository: https://github.com/PlatinumArts/Platinum-Arts-Sandbox-Free-Game-Maker.git
+- Code language: C++, C
+- Code license: Custom (MIT, modified zlib: requires special credits and notifications)
+
+## Building
+