game entry file names changed to canonical version

games/lumix_engine.md

@@ -0,0 +1,16 @@
+# Lumix Engine
+
+_3D Game Engine_
+
+- Home: https://github.com/nem0/lumixengine
+- State: beta
+- Download: https://github.com/nem0/LumixEngine/releases
+- Keywords: framework, 3D
+- Code repository: https://github.com/nem0/lumixengine.git, https://github.com/nem0/lumixengine_data.git (related)
+- Code language: C++
+- Code license: MIT
+
+## Building
+
+Uses GENie as build tool.
+