Add codeship badge to README

README.md

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 # Tokens
+[ ![Codeship Status for ConsenSys/Tokens](https://app.codeship.com/projects/ccf33380-4dfa-0135-cfa1-72c4965f7f14/status?branch=master)](https://app.codeship.com/projects/233433)
 
 This repo contains Solidity smart contract code to issue simple, standards-compliant tokens on Ethereum. It can be used to create any form of asset, currency, coin, hours, usage tokens, vunk, etc.