Improve README and add MIT license

Author: carllerche

LICENSE

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+Copyright (c) 2014 Carl Lerche and other MIO contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

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-# MIO - Mini IO
+# MIO - Metal IO
 
-A lightweight non-blocking IO library for Rust.
+MIO is a lightweight IO library for Rust with a focus on adding as
+little overhead as possible over the OS abstractions.
 
-## Summary
+## Features
 
-Uses the reactor pattern.
+* Event loop backed by epoll, kqueue.
+* Zero allocations at runtime
+* Non-blocking TCP sockets
+* High performance timer system
+* Thread safe message channel for cross thread communication
+
+__Coming soon__
+
+* UDP and Unix domain sockets
+* Signal handling
+
+## Non goals
+
+The following are specifically omitted from MIO and are left to the user
+or higher level libraries.
+
+* File operations
+* Thread pools / multi-threaded reactor
+
+## Platforms
+
+Currently, MIO only supports Linux and Darwin. However, Windows support
+will be coming soon. The goal is to support all platforms that Rust
+supports.