docs: add badges to the readme (#20)

Author: JustinBeckwith

README.md

@@ -1,5 +1,11 @@
 # google-ts-style
 
+[![NPM Version][npm-image]][npm-url]
+[![Build Status][travis-image]][travis-url]
+[![Dependency Status][david-image]][david-url]
+[![devDependency Status][david-dev-image]][david-dev-url]
+[![Known Vulnerabilities][snyk-image]][snyk-url]
+
 > ***NOTE: This repo is a work-in-progress and is not ready for general use just yet. This is not an official Google product.***
 
 This repository is Google's default TypeScript configuration. Made with ❤️ by the Google Node.js team.
@@ -25,3 +31,14 @@ $(npm bin)/gts --init
 
 # License
 See [LICENSE.md](LICENSE.md)
+
+[npm-image]: https://img.shields.io/npm/v/google-ts-style.svg
+[npm-url]: https://npmjs.org/package/google-ts-style
+[travis-image]: https://travis-ci.org/google/ts-style.svg?branch=master
+[travis-url]: https://travis-ci.org/google/ts-style
+[david-image]: https://david-dm.org/google/ts-style.svg
+[david-url]: https://david-dm.org/google/ts-style
+[david-dev-image]: https://david-dm.org/google/ts-style/dev-status.svg
+[david-dev-url]: https://david-dm.org/google/ts-style?type=dev
+[snyk-image]: https://snyk.io/test/github/google/ts-style/badge.svg
+[snyk-url]: https://snyk.io/test/github/google/ts-style