Create Swift manifest.

library/swift

@@ -0,0 +1,6 @@
+Maintainers: Haris Amin <[email protected]> (@hamin),
+             Thomas Catterall <[email protected]> (@swizzlr)
+GitRepo: https://github.com/swiftdocker/docker-swift.git
+
+Tags: 3.0.2, 3.0, 3, latest
+GitCommit: cc3654e99ab82f21fd7ab8a427932e19f433d8ee