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

entries/nxengine.md

@@ -0,0 +1,19 @@
+# NXEngine
+
+_Remake of Cave Story._
+
+- Home: http://nxengine.sourceforge.net/, https://exlmoto.ru/nxengine/
+- Media: https://en.wikipedia.org/wiki/Cave_Story#Legacy
+- State: mature
+- Download: https://github.com/EXL/NXEngine/releases
+- Keywords: platform, free content, inspired by Cave Story, remake
+- Code repository: https://github.com/EXL/NXEngine.git
+- Code language: C, C++
+- Code license: GPL-3.0
+- Code dependencies: SDL
+
+Does it require original content?
+
+## Building
+
+- Build system: QMake