Add license file (#19)

Author: parroty

LICENSE

@@ -0,0 +1,20 @@
+Copyright (c) 2013-2015 parroty
+
+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

@@ -1,4 +1,4 @@
-# ExVCR [![Build Status](https://secure.travis-ci.org/parroty/exvcr.png?branch=master "Build Status")](http://travis-ci.org/parroty/exvcr) [![Coverage Status](https://coveralls.io/repos/parroty/exvcr/badge.png?branch=master)](https://coveralls.io/r/parroty/exvcr?branch=master)
+# ExVCR [![Build Status](https://secure.travis-ci.org/parroty/exvcr.png?branch=master "Build Status")](http://travis-ci.org/parroty/exvcr) [![Coverage Status](https://coveralls.io/repos/parroty/exvcr/badge.png?branch=master)](https://coveralls.io/r/parroty/exvcr?branch=master) [![License](http://img.shields.io/badge/license-MIT-brightgreen.svg)](http://opensource.org/licenses/MIT)
 
 
 Record and replay HTTP interactions library for elixir.