game entry file names changed to canonical version

games/openmw.md

@@ -0,0 +1,15 @@
+# OpenMW
+
+_Unofficial open source engine reimplementation of the game Morrowind._
+
+- Home: http://openmw.org/en/
+- Media: https://en.wikipedia.org/wiki/OpenMW
+- State: mature
+- Download: https://openmw.org/downloads/
+- Keywords: role playing, game engine, remake, requires original content (Morrowind)
+- Code repository: https://github.com/OpenMW/openmw.git
+- Code language: C++
+- Code license: GPL-3.0
+
+## Building
+