Add very basic README.

README.md

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+# go-cidutil
+
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](http://ipn.io)
+[![](https://img.shields.io/badge/project-IPFS-blue.svg?style=flat-square)](http://ipfs.io/)
+[![standard-readme compliant](https://img.shields.io/badge/standard--readme-OK-green.svg?style=flat-square)](https://github.com/RichardLitt/standard-readme)
+[![GoDoc](https://godoc.org/github.com/ipfs/go-ipfs-cidutil?status.svg)](https://godoc.org/github.com/ipfs/go-ipfs-cidutil)
+[![Build Status](https://travis-ci.org/ipfs/go-ipfs-cidutil.svg?branch=master)](https://travis-ci.org/ipfs/go-ipfs-cidutil)
+
+> go-cidutil implements various utilities and helper functions for working with CIDs
+
+## Contribute
+
+PRs accepted.
+
+Small note: If editing the README, please conform to the [standard-readme](https://github.com/RichardLitt/standard-readme) specification.
+
+## License
+
+MIT © Protocol Labs, Inc.