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

entries/dave_gnukem.md

@@ -0,0 +1,15 @@
+# Dave Gnukem
+
+_Retro-style 2D scrolling platform shooter similar to, and inspired by, Duke Nukem 1._
+
+- Home: https://djoffe.com/gnukem/, https://sourceforge.net/projects/gnukem/
+- State: mature
+- Download: https://sourceforge.net/projects/gnukem/files/gnukem/
+- Platform: Windows, Linux, macOS
+- Keywords: platform, 2D, inspired by Duke Nukem, open content, shooter
+- Code repository: https://github.com/davidjoffe/dave_gnukem.git
+- Code language: C++
+- Code license: GPL-2.0
+- Code dependencies: SDL
+
+## Building