update readme

README.md

@@ -1 +1,43 @@
-# github-contribution-color-graph
+GitHub Contribution Color Graph
+===============================
+
+[![Build Status][travis-image]][travis-url]
+[![Dependency Status][gemnasium-image]][gemnasium-url]
+
+Change colors of contribution graph in GitHub.
+
+Setup
+-----
+
+```bash
+$ npm install
+```
+
+Test
+----
+
+```bash
+$ npm test
+```
+
+Build
+-----
+
+```bash
+$ grunt build
+```
+
+Screenshot
+----------
+
+![Screenshot](https://raw.github.com/williambelle/github-contribution-color-graph/master/docs/screenshot.png)
+
+License
+-------
+
+The MIT License (MIT)
+
+[travis-image]: https://travis-ci.org/williambelle/github-contribution-color-graph.svg?branch=master
+[travis-url]: https://travis-ci.org/williambelle/github-contribution-color-graph
+[gemnasium-image]: https://gemnasium.com/badges/github.com/williambelle/github-contribution-color-graph.svg
+[gemnasium-url]: https://gemnasium.com/github.com/williambelle/github-contribution-color-graph