add readme

Author: yyx990803

README.md

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+# laravel-elixir-vue-2
+
+> Laravel Elixir 6 support for Vue 2.0
+
+This package provides Webpack support for compiling Vue 2.0 `.vue` files in your Laravel Elixir 6 projects. Please note that, if using Laravel Elixir 5 or below, you don't want this package.
+
+Usage is identical to [laravel-elixir-vue](https://github.com/JeffreyWay/laravel-elixir-vue):
+
+## Step 1: Install
+
+```
+npm install laravel-elixir-vue-2 --save-dev
+```
+
+## Step 2: Gulpfile.js
+
+```
+var elixir = require('laravel-elixir');
+
+require('laravel-elixir-vue-2');
+
+elixir(function(mix) {
+    mix.webpack('main.js'); // resources/assets/js/main.js
+});
+```