Add a README

README.md

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+# tokio-service
+
+Definition of the core `Service` trait in Tokio
+
+[![Build Status](https://travis-ci.org/tokio-rs/tokio-service.svg?branch=master)](https://travis-ci.org/tokio-rs/tokio-service)
+[![Build status](https://ci.appveyor.com/api/projects/status/qgostmtadmlqae8n?svg=true)](https://ci.appveyor.com/project/alexcrichton/tokio-service)
+
+[Documentation](https://tokio-rs.github.io/tokio-service)
+
+## Usage
+
+First, add this to your `Cargo.toml`:
+
+```toml
+[dependencies]
+tokio-service = { git = "https://github.com/tokio-rs/tokio-service" }
+```
+
+Next, add this to your crate:
+
+```rust
+extern crate tokio_service;
+```
+
+# License
+
+`tokio-service` is primarily distributed under the terms of both the MIT
+license and the Apache License (Version 2.0), with portions covered by various
+BSD-like licenses.
+
+See LICENSE-APACHE, and LICENSE-MIT for details.