Add readme

README.md

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+# Eth ENS Namehash [![CircleCI](https://circleci.com/gh/flyswatter/eth-ens-namehash.svg?style=svg)](https://circleci.com/gh/flyswatter/eth-ens-namehash)
+
+A javascript library for generating ENS namehashes per spec https://github.com/ethereum/EIPs/issues/137
+
+# Does not yet work!
+
+## Usage
+
+```javascript
+var namehash = require('eth-ens-namehash')
+var hash = namehash('foo.eth')
+// '0xde9b09fd7c5f901e23a3f19fecc54828e9c848539801e86591bd9801b019f84f'
+```