add README

Author: Alanscut

README.md

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+# crypto-js [![Build Status](https://travis-ci.org/brix/crypto-js.svg?branch=develop)](https://travis-ci.org/brix/crypto-js)
+
+JavaScript library of crypto standards.
+
+## Node.js (Install)
+
+Requirements:
+
+- Node.js
+- npm (Node.js package manager)
+
+```bash
+npm install crypto-js
+```
+
+### Usage
+
+Including all libraries, for access to extra methods:
+
+```javascript
+import CryptoJS from 'crypto-js';
+const rst = CryptoJS.MD5("Message").toString();
+```
+