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

entries/operation_citadel.md

@@ -0,0 +1,14 @@
+# Operation Citadel
+
+_A WWII, turn based platoon, company level war game on the Eastern Front._
+
+- Home: http://kursk.sourceforge.net/, https://sourceforge.net/projects/kursk
+- State: beta, inactive since 2000
+- Download: https://sourceforge.net/projects/kursk/files
+- Keywords: strategy
+- Code repository: https://gitlab.com/osgames/kursk.git (snapshot of source releases)
+- Code language: C++
+- Code license: GPL-2.0
+
+## Building
+