Readme: Add shields
SCION
=====
+[![Documentation](https://godoc.org/github.com/scionproto/scion?status.svg)](http://godoc.org/github.com/scionproto/scion)
+[![Build Status](https://badge.buildkite.com/cbb8e648c58d567991b445317d68955db5235b627dcfc97ab9.svg?branch=master)](https://buildkite.com/scionproto/scionproto)
+[![Go Report Card](https://goreportcard.com/badge/github.com/scionproto/scion)](https://goreportcard.com/report/github.com/scionproto/scion)
+[![GitHub issues](https://img.shields.io/github/issues/scionproto/scion/help%20wanted.svg?label=help%20wanted&color=blue)](https://github.com/scionproto/scion/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22)
+[![Release](https://img.shields.io/github/release-pre/scionproto/scion.svg)](https://github.com/scionproto/scion/releases)
+[![license](https://img.shields.io/github/license/scionproto/scion.svg?maxAge=2592000)](https://github.com/scionproto/scion/blob/master/LICENSE)
An implementation of [SCION](http://www.scion-architecture.net), a future
Internet architecture.
