moved the entries up one folder, added the folder to the keywords

games/operation_citadel.md

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+# 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
+