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

games/warzone_2100.md

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+# Warzone 2100
+
+_Full campaign with optional (but strongly recommended!), videos, battle against four factions, multi-player and single-player skirmish modes, and an extensive tech tree and a full unit designer._
+
+- Home: http://wz2100.net/, https://sourceforge.net/projects/warzone2100/
+- State: mature
+- Download: https://sourceforge.net/projects/warzone2100/files/releases/
+- Keywords: strategy, RTS, popular
+- Code repository: https://github.com/Warzone2100/warzone2100.git
+- Code language: C++
+- Code license: GPL-2.0
+
+## Building
+
+- Build system: CMake