Add simple way to test (#12)

test/webpack.config.js

@@ -0,0 +1,20 @@
+const MonacoWebpackPlugin = require('../index.js');
+const path = require('path');
+
+module.exports = {
+    mode: 'development',
+    entry: './index.js',
+    output: {
+        path: path.resolve(__dirname, 'dist'),
+        filename: 'app.js'
+    },
+    module: {
+        rules: [{
+            test: /\.css$/,
+            use: ['style-loader', 'css-loader']
+        }]
+    },
+    plugins: [
+        new MonacoWebpackPlugin()
+    ]
+};