Move book files into root

Author: Pascal Hertleif

meta/.travis.yml renamed to .travis.yml

@@ -1,2 +1,35 @@
-# book
-  Documentation on how to use the Rust Programming Language to develop commandline applications
+# CLI working group
+
+This repo is for coordinating the work of the Rust CLI Working Group,
+also known as "Rust CLIQuE" (Rust CLI Quality Enhancement).
+
+It also contains the CLAiR, the [Command Line Applications in Rust][clair] book.
+
+[clair]: https://rust-lang-nursery.github.io/cli-wg/
+
+- [Working groups?](https://internals.rust-lang.org/t/announcing-the-2018-domain-working-groups/6737)
+- [Announcement of this WG](https://internals.rust-lang.org/t/announcing-the-cli-working-group/6872/1)
+- Chat with us
+  - [Discord](https://discord.gg/dwq4Zme)
+
+## Our goal
+
+Let's make this a true statement:
+
+Rust makes writing crossplatform, tested, modern command line applications frictionless
+while incorporating industry best practices and providing great documentation.
+
+## What's a CLI?
+
+For our intents and purposes, a CLI is any program that
+
+* Launches in a terminal
+* Accepts configuration from various sources, such as command line arguments, environment variables, or configuration files 
+* Runs to completion with minimal/no user interaction 
+* Accepts input from `stdin`, files, or network
+* Performs processing on some input (files, network, `stdin`) based on the configuration specified
+* Communicates via standard outputs (files, network, `std{out,err}`) 
+
+(We [specifically][i4] don't want to focus on "TUI" apps right now.)
+
+[i4]: https://github.com/rust-lang-nursery/cli-wg/issues/4