added keywords (originals, type) from osgameclones, changed readme categories not as list anymore

games/open_panzer.md

@@ -4,7 +4,7 @@ _Hex and turn based strategy game, a remake of good old Panzer General 2._
 
 - Home: http://www.linuxconsulting.ro/openpanzer/
 - State: mature
-- Keywords: strategy, online
+- Keywords: strategy, inspired by Open Panzer, online
 - Code repository: https://github.com/nicupavel/openpanzer.git
 - Code language: JavaScript
 - Code license: GPL-2.0