SwiftRepl.md

Steps to use a Swift package you are creating in the REPL. Assuming the package is named lump.

1. Add a dynamic library product to the manifest: .library( name: "lump", type: .dyanmic, targets: ["lump"]),
2. Build package as normal: swift build
3. Fire up the REPL as follows: swift -I .build/debug -L .build/debug -llump

(updated for Swift 4)

Got the Swift 4 version finished finally; took 3 tries to fix minor mistakes...