Create README.md

Author: Ericson2314

README.md

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+# core-io [![Build Status](https://travis-ci.org/QuiltOS/core-io.svg?branch=master)](https://travis-ci.org/QuiltOS/core-io)
+
+`core-io` is an alternative `no_std` I/O library for Rust. 
+Unlike `std::io`, it uses an associated error type instead of baking in a single `io::Error`.
+This way it supports a wider variety of implementees and only depend on `core`.
+Other than that difference, it seeks to match `std::io`'s traits as closely as possible.