Adds missing README.md

README.md

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+haskell-bitcoin-tx
+==================
+
+[![Build Status](https://travis-ci.org/solatis/haskell-bitcoin-tx.png?branch=master)](https://travis-ci.org/solatis/haskell-bitcoin-tx)
+[![Coverage Status](https://coveralls.io/repos/solatis/haskell-bitcoin-tx/badge.svg?branch=master)](https://coveralls.io/r/solatis/haskell-bitcoin-tx?branch=master)
+[![MIT](http://b.repl.ca/v1/license-MIT-blue.png)](http://en.wikipedia.org/wiki/MIT_License)
+[![Haskell](http://b.repl.ca/v1/language-haskell-lightgrey.png)](http://haskell.org)
+
+This library provides the same functionality as the bitcoin-tx command line
+utility, which was introduced in Bitcoin Core v0.10. These functions are
+pure and require no communication with a bitcoin daemon.