Describe project status in the README

Author: jatoben

README.md

@@ -1,166 +1,12 @@
-# CommandLineKit [![Build Status](https://travis-ci.org/jatoben/CommandLine.svg?branch=master)](https://travis-ci.org/jatoben/CommandLine)
+# CommandLineKit
 
 A pure Swift library for creating command-line interfaces.
 
-*Note: CommandLineKit `master` requires Xcode 8 / Swift 3.0. If you're using older versions of Swift, please check out the [earlier releases](https://github.com/jatoben/CommandLine/releases).*
+*Note: This project is no longer maintained. It's preserved here for historical interest only. Thanks to everyone who contributed!*
 
-## Usage
+## License
 
-CommandLine aims to have a simple and self-explanatory API.
-
-```swift
-import CommandLineKit
-
-let cli = CommandLineKit.CommandLine()
-
-let filePath = StringOption(shortFlag: "f", longFlag: "file", required: true,
-  helpMessage: "Path to the output file.")
-let compress = BoolOption(shortFlag: "c", longFlag: "compress",
-  helpMessage: "Use data compression.")
-let help = BoolOption(shortFlag: "h", longFlag: "help",
-  helpMessage: "Prints a help message.")
-let verbosity = CounterOption(shortFlag: "v", longFlag: "verbose",
-  helpMessage: "Print verbose messages. Specify multiple times to increase verbosity.")
-
-cli.addOptions(filePath, compress, help, verbosity)
-
-do {
-  try cli.parse()
-} catch {
-  cli.printUsage(error)
-  exit(EX_USAGE)
-}
-
-print("File path is \(filePath.value!)")
-print("Compress is \(compress.value)")
-print("Verbosity is \(verbosity.value)")
-```
-
-See `Option.swift` for additional Option types.
-
-To use CommandLineKit in your project, add it to your workspace, then add CommandLineKit.framework to the __Build Phases / Link Binary With Libraries__ setting of your target.
-
-If you are building a command-line tool and need to embed this and other frameworks to it, follow the steps in http://colemancda.github.io/2015/02/12/embedded-swift-frameworks-osx-command-line-tools/ to link Swift frameworks to your command-line tool.
-
-If you are building a standalone command-line tool, you'll need to add the CommandLineKit source files directly to your target, because Xcode [can't yet build static libraries that contain Swift code](https://github.com/ksm/SwiftInFlux#static-libraries).
-
-
-## Features
-
-### Automatically generated usage messages
-
-```
-Usage: example [options]
-  -f, --file:    
-      Path to the output file.
-  -c, --compress:
-      Use data compression.
-  -h, --help:    
-      Prints a help message.
-  -v, --verbose:
-      Print verbose messages. Specify multiple times to increase verbosity.
-```
-
-You can fully customize the usage message by supplying a `formatOutput` function. For example, [Rainbow](https://github.com/onevcat/Rainbow) provides a handy way to generate colorized output:
-
-```swift
-import Rainbow
-
-cli.formatOutput = { s, type in
-  var str: String
-  switch(type) {
-  case .Error:
-    str = s.red.bold
-  case .OptionFlag:
-    str = s.green.underline
-  case .OptionHelp:
-    str = s.blue
-  default:
-    str = s
-  }
-
-  return cli.defaultFormat(str, type: type)
-}
-```
-
-![](https://cloud.githubusercontent.com/assets/318083/12108437/1e3ec25c-b335-11e5-9cc9-d45ad3ab3dc7.png)
-
-### Supports all common flag styles
-
-These command-lines are equivalent:
-
-```bash
-$ ./example -c -v -f /path/to/file
-$ ./example -cvf /path/to/file
-$ ./example -c --verbose --file /path/to/file
-$ ./example -cv --file /path/to/file
-$ ./example --compress -v --file=/path/to/file
-```
-
-Option processing can be stopped with '--', [as in getopt(3)](https://www.gnu.org/prep/standards/html_node/Command_002dLine-Interfaces.html).
-
-### Intelligent handling of negative int & float arguments
-
-This will pass negative 42 to the int option, and negative 3.1419 to the float option:
-
-```bash
-$ ./example2 -i -42 --float -3.1419
-```
-
-### Locale-aware float parsing
-
-Floats will be handled correctly when in a locale that uses an alternate decimal point character:
-
-```bash
-$ LC_NUMERIC=sv_SE.UTF-8 ./example2 --float 3,1419
-```
-
-### Type-safe Enum options
-
-```swift
-enum Operation: String {
-  case create  = "c"
-  case extract = "x"
-  case list    = "l"
-  case verify  = "v"
-}
-
-let cli = CommandLineKit.CommandLine()
-let op = EnumOption<Operation>(shortFlag: "o", longFlag: "operation", required: true,
-  helpMessage: "File operation - c for create, x for extract, l for list, or v for verify.")
-cli.setOptions(op)
-
-do {
-  try cli.parse()
-} catch {
-  cli.printUsage(error)
-  exit(EX_USAGE)
-}
-
-switch op.value {
-  case Operation.Create:
-    // Create file
-
-  case Operation.Extract:
-    // Extract file
-
-  // Remainder of cases
-}
-```
-
-Note: Enums must be initalizable from a String value.
-
-### Fully emoji-compliant
-
-```bash
-$ ./example3 -👍 --👻
-```
-
-*(please don't actually do this)*
-
-License
--------
-Copyright (c) 2014 Ben Gollmer.
+Copyright (c) 2014-18 Ben Gollmer.
 
 Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at