docs(readme): add usage

README.md

@@ -1,3 +1,51 @@
 # hugo-bin [![Build Status](https://travis-ci.org/fenneclab/hugo-bin.svg?branch=master)](https://travis-ci.org/fenneclab/hugo-bin)
 
-Binary wrapper for [Hugo](https://github.com/spf13/hugo)
+> Binary wrapper for [Hugo](https://github.com/spf13/hugo)
+
+## Install
+
+```
+npm install --save-dev hugo-bin
+```
+
+## Usage
+
+### API
+
+```js
+const execFile = require('child_process').execFile;
+const hugo = require('hugo-bin');
+
+execFile(hugo, ['version'], (err, stdout) => {
+  console.log(stdout);
+});
+```
+
+### CLI
+
+```sh
+$(npm bin)/hugo --help
+npm run create -- 'post/my-new-post' # see below 'npm-run-script'
+```
+
+### npm-run-script
+
+```json
+{
+  "scripts": {
+    "build": "hugo",
+    "create":  "hugo new",
+    "serve": "hugo server -ws"
+  }
+}
+```
+
+See the [Hugo Documentation](http://gohugo.io) for more information.
+
+## Super Inspired By
+
+- [mastilver/apex-bin](https://github.com/mastilver/apex-bin)
+
+## License
+
+MIT © [Shun Sato](http://blog.fenneclab.com)