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

entries/rigel_engine.md

@@ -0,0 +1,16 @@
+# Rigel Engine
+
+_Remake of Duke Nukem II._
+
+- Home: https://github.com/lethal-guitar/RigelEngine
+- State: beta
+- Download: https://github.com/lethal-guitar/RigelEngine/releases
+- Keywords: action, commercial content, game engine, inspired by Duke Nukem II, remake, requires original content, shooter
+- Code repository: https://github.com/lethal-guitar/RigelEngine.git
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: SDL2
+
+## Building
+
+- Build system: CMake