Add README

Author: Ffloriel

README.md

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+# purgecss-webpack-plugin  
+<!-- [![Build Status](https://travis-ci.org/FullHuman/purgecss-webpack-plugin.svg?branch=master)](https://travis-ci.org/FullHuman/purgecss-webpack-plugin)
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+[![dependencies Status](https://david-dm.org/fullhuman/purgecss-webpack-plugin/status.svg)](https://david-dm.org/fullhuman/purgecss-webpack-plugin)
+[![devDependencies Status](https://david-dm.org/fullhuman/purgecss-webpack-plugin/dev-status.svg)](https://david-dm.org/fullhuman/purgecss-webpack-plugin?type=dev)
+
+[Webpack](https://github.com/webpack/webpack) plugin to remove unused css.
+
+## Install
+
+```sh
+npm i purgecss-webpack-plugin -D
+```
+
+## Usage
+
+```js
+const path = require('path')
+const glob = require('glob')
+const ExtractTextPlugin = require('extract-text-webpack-plugin')
+const PurgecssPlugin = require('../../')
+
+const PATHS = {
+    src: path.join(__dirname, 'src')
+}
+
+module.exports = {
+    entry: './src/index.js',
+    output: {
+        filename: 'bundle.js',
+        path: path.join(__dirname, 'dist')
+    },
+    module: {
+        rules: [
+            {
+                test: /\.css$/,
+                use: ExtractTextPlugin.extract({
+                    fallback: 'style-loader',
+                    use: 'css-loader?sourceMap'
+                })
+            }
+        ]
+    },
+    plugins: [
+        new ExtractTextPlugin('[name].css?[hash]'),
+        new PurgecssPlugin({
+            paths: glob.sync(`${PATHS.src}/*`),
+            styleExtensions: ['.css']
+        })
+    ]
+}
+```
+
+## Contributing
+
+Please read [CONTRIBUTING.md](./.github/CONTRIBUTING.md) for details on our code of conduct, and the process for submitting pull requests to us.
+
+## Versioning
+
+We use [SemVer](http://semver.org/) for versioning. 
+
+
+## Acknowledgment
+
+Purgecss was originally thought as the v2 of purifycss. And because of it, it is greatly inspired by it.  
+The plugins such as purgecss-webpack-plugin are based on the purifycss plugin.   
+Below is the list of the purifycss repositories:  
+- [purifycss](https://github.com/purifycss/purifycss)
+- [gulp-purifycss](https://github.com/purifycss/gulp-purifycss)
+- [purifycss-webpack](https://github.com/webpack-contrib/purifycss-webpack)
+
+## License
+
+This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details
+