Add 'Contributing' CodeTour (#138)
Add 'Contributing' CodeTour (#138)

Issue [#117](https://github.com/NotMyself/DotNetCoreKoans/issues/117)

Co-authored-by: Dan Schnau <71da72682d86157188ee22d0a0ab6d1aa4714b52@skykick.com>
NotMyself/DotNetCoreKoans