Create README.md

Author: s0ph1e

README.md

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+## Introduction
+Parse urls from css file
+
+[![Build Status](https://img.shields.io/travis/s0ph1e/node-css-url-parser/master.svg?style=flat)](https://travis-ci.org/s0ph1e/node-css-url-parser)
+[![Coverage Status](https://coveralls.io/repos/s0ph1e/node-css-url-parser/badge.svg)](https://coveralls.io/r/s0ph1e/node-css-url-parser)
+
+## Installation
+`npm install css-url-parser`
+
+## Usage
+```javascript
+var parseCssUrls = require('css-url-parser'); 
+
+var css = '@import "a.css"; .image { background-image: url(images/img.png); }';
+var cssUrls = parseCssUrls(css);
+
+console.log(cssUrls);   // [ 'a.css', 'images/img.png' ]
+```
+