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

entries/unvanquished.md

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+# Unvanquished
+
+_FPS/RTS hybrid game powered by the Daemon engine (a combination of ioq3 and XreaL)._
+
+- Home: https://unvanquished.net/, https://sourceforge.net/projects/unvanquished/
+- Media: https://en.wikipedia.org/wiki/Unvanquished_(video_game)
+- State: mature 
+- Download: https://unvanquished.net/?page_id=318
+- Platform: Windows, Linux, macOS
+- Keywords: action, shooter
+- Code repository: https://github.com/Unvanquished/Unvanquished.git, https://github.com/DaemonEngine/Daemon.git (+)
+- Code language: C, C++
+- Code license: GPL-3.0
+- Code dependencies: Dæmon engine
+- Assets license: CC-BY-SA-2.5
+
+## Building
+
+- Build system: CMake
+