添加 readme

README.MD

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+# ES6新特性学习~
+
+### 目录
+
+* [let const](https://github.com/dptms/es6/blob/master/1.var-let-const.md)
+* [箭头函数](https://github.com/dptms/es6/blob/master/2.arrow-function.md)
+* [默认参数](https://github.com/dptms/es6/blob/master/3.default-augument.md)
+* [模板字符串](https://github.com/dptms/es6/blob/master/4.template-string.md)
+* [字符串新方法](https://github.com/dptms/es6/blob/master/5.new-string-methods.md)
+* [对象解构](https://github.com/dptms/es6/blob/master/6.destructuring-objects.md)
+* [数组解构](https://github.com/dptms/es6/blob/master/7.destructuring-array.md)
+* [for of循环]https://github.com/dptms/es6/blob/master/8.for-of-loop.md()
+* [Arra.from() Array.of()](https://github.com/dptms/es6/blob/master/9.array-from-array-of.md)
+* [数组新方法](https://github.com/dptms/es6/blob/master/10.array-methods.md)
+* [剩余参数](https://github.com/dptms/es6/blob/master/11.rest-params.md)
+* [扩展运算符](https://github.com/dptms/es6/blob/master/12.spread-operator-intro.md)