Add README

Author: garyb

README.md

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+# purescript-codec-argonaut
+
+[![Latest release](http://img.shields.io/github/release/garyb/purescript-codec-argonaut.svg)](https://github.com/slamdata/purescript-codec-argonaut/releases)
+[![Build Status](https://travis-ci.org/garyb/purescript-codec-argonaut.svg?branch=master)](https://travis-ci.org/garyb/purescript-codec-argonaut)
+
+Bi-directional codecs for [argonaut](https://github.com/purescript-contrib/purescript-argonaut-core).
+
+## Installation
+
+```
+bower install purescript-codec-argonaut
+```
+
+## Documentation
+
+Module documentation is [published on Pursuit](http://pursuit.purescript.org/packages/purescript-codec-argonaut).