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

entries/softpixel_engine.md

@@ -0,0 +1,18 @@
+# SoftPixel Engine
+
+_High-level real-time 3d engine._
+
+- Home: http://softpixelengine.sourceforge.net/, https://sourceforge.net/projects/softpixelengine/
+- State: mature, inactive since 2013 
+- Download: http://softpixelengine.sourceforge.net/downloads.html
+- Platform: Windows, Linux
+- Keywords: framework, 3D
+- Code repository: https://gitlab.com/osgames/softpixelengine.git (import of svn), https://svn.code.sf.net/p/softpixelengine/code/trunk (svn)
+- Code language: C++
+- Code license: zlib
+
+See also [SoftPixel Editor](https://sourceforge.net/projects/softpixeleditor/)
+
+## Building
+
+- Build system: CMake