Add example config for less and sass preprocessing

Author: michaeldyrynda

src/tailwindcss-stubs/webpack.mix.js

@@ -16,3 +16,18 @@ mix.js('resources/assets/js/app.js', 'public/js')
    .postCss('resources/assets/css/main.css', 'public/css', [
         tailwindcss('tailwind.js'),
    ]);
+
+// If you want to use LESS for your preprocessing
+// mix.less('resources/assets/less/main.less', 'public/css')
+//   .options({
+//     postCss: [
+//       tailwindcss('./tailwind.js'),
+//     ]
+//   })
+
+// If you want to use SASS for preprocessing
+// mix.sass('resources/assets/sass/app.scss', 'public/css')
+//    .options({
+//       processCssUrls: false,
+//       postCss: [ tailwindcss('tailwind.js') ],
+//    });