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

entries/zdoom.md

@@ -0,0 +1,18 @@
+# ZDoom
+
+_Remake of Doom, Doom II, Heretic, Hexen._
+
+- Home: http://zdoom.org/, https://sourceforge.net/projects/zdoom/
+- State: mature
+- Download: https://zdoom.org/downloads, https://github.com/coelckers/gzdoom/releases, https://sourceforge.net/projects/zdoom/files/
+- Platform: Windows, Linux, macOS
+- Keywords: remake, commercial content (?), first-person, inspired by Doom + Doom II + Heretic + Hexen, requires original content, shooter
+- Code repository: https://github.com/coelckers/gzdoom.git, https://git.code.sf.net/p/zdoom/gzdoom
+- Code language: C, C++, ZenScript
+- Code license: GPL-3.0
+
+Maybe ZDoom and GZDoom should be splitted.
+
+## Building
+
+- Build system: CMake