Add README, CONTRIBUTING and LICENSE files to project, just for ease of browsing and searching on OS X.
Add README, CONTRIBUTING and LICENSE files to project, just for ease of browsing and searching on OS X.

apple/swift-corelibs-xctest,tiagomartinho/swift-corelibs-xctest,yoonapps/swift-corelibs-xctest,apple/swift-corelibs-xctest,tiagomartinho/swift-corelibs-xctest,yoonapps/swift-corelibs-xctest