Created Code::blocks project file for Chipmunk 7 (master

[phaikawl]

I created a Code::blocks project file for Chipmunk 7 at master. At the moment I think it's the easiest way to compile Chipmunk 7 on Windows with the MinGW compiler. Hope this helps.
I created a pull request with some tiny fixes that I don't know if legit or not.
https://github.com/slembcke/Chipmunk2D/pull/70