game entry file names changed to canonical version

games/c-dogs.md

@@ -0,0 +1,20 @@
+# C-Dogs
+
+_Overhead run-and-gun game._
+
+- Home: https://cxong.github.io/cdogs-sdl/
+- Media: https://en.wikipedia.org/wiki/C-Dogs
+- State: mature 
+- Download: https://cxong.github.io/cdogs-sdl/downloads.html
+- Platform: Windows, Linux, macOS
+- Keywords: action, shooter
+- Code repository: https://github.com/cxong/cdogs-sdl.git
+- Code language: C
+- Code license: GPL-2.0
+- Code dependencies: SDL
+- Assets license: CC-BY
+
+## Building
+
+- Build system: CMake
+