Add an open source license

[peplin]

Hey, your work on this speedometer looks great and I'd love to use in some apps with the OpenXC platform (http://openxcplatform.com/) but there's currently no open source license attached to your code so it's difficult for me to use. Would you mind adding one? BSD or MIT would be awesome, if you're OK with either.

[bilthon]

Sorry I took that long to answer. But yes you guys can use it as much as you like. Any improvement is also welcome. I'll take some time to include a licence