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

entries/the_eternity_engine.md

@@ -0,0 +1,17 @@
+# The Eternity Engine
+
+_DOOM source port._
+
+- Home: http://eternity.youfailit.net/wiki/Main_Page
+- State: mature
+- Download: https://github.com/team-eternity/eternity/releases
+- Platform: Windows, Linux, macOS
+- Keywords: game engine, firs person, inspired by DOOM, remake, requires original content, shooter
+- Code repository: https://github.com/team-eternity/eternity.git
+- Code language: C, C++
+- Code license: GPL-3.0
+
+## Building
+
+- Build system: CMake
+