moved the entries up one folder, added the folder to the keywords

games/softpixel_engine.md

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+# SoftPixel Engine
+
+_High-level real-time 3d engine._
+
+- Home: http://softpixelengine.sourceforge.net/
+- State: mature, inactive since 2013 
+- Download: http://softpixelengine.sourceforge.net/downloads.html
+- Platform: Windows, Linux
+- Keywords: framework, 3D
+- Code repository:  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