docs(README): add install section

lihuakkk · May 10, 2017 · d9aac8b · d9aac8b
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 A plugin for [PostCSS](https://github.com/ai/postcss) that generates rem units from pixel units.
 
+## Install
+
+```shell
+$ npm install postcss-pxtorem --save-dev
+```
 
 ## Usage