Added instructions for Laravel Mix.

Author: rmariuzzo

README.md

@@ -38,6 +38,23 @@ module.exports = {
 }
 ```
 
+### Laravel Mix
+
+```js
+// webpack.mix.js
+mix.webpackConfig({
+  module: {
+    rules: [
+      {
+        // Matches all PHP or JSON files in `resources/lang` directory.
+        test: /resources\/lang.+\.(php|json)$/,
+        loader: 'laravel-localization-loader',
+      }
+    ]
+  }
+});
+```
+
 ## Usage
 
 ### Lang.js