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

entries/gzdoom.md

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+# GZDoom
+
+_Remake of Doom, Doom II, Heretic, Hexen._
+
+- Home: https://zdoom.org/index, https://web.archive.org/web/20151014204540/http://www.osnanet.de/c.oelckers/gzdoom/
+- State: mature
+- Download: https://zdoom.org/downloads
+- Platform: Windows, Linux, macOS
+- Keywords: action, first-person, inspired by Doom + Doom II + Heretic + Hexen, non-free content, remake, requires content, shooter
+- Code repository: https://github.com/coelckers/gzdoom.git
+- Code language: C, C++
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: CMake