fix readme

readme.md

@@ -10,4 +10,16 @@ yarn add babel-loader babel-core babel-preset-es2015 babel-preset-react --dev
 yarn add html-webpack-plugin
 
 yarn add react react-dom
+
+# 产品编译及压缩
+# https://webpack.js.org/guides/production-build/
+webpack -p
+
+# 线上环境产生文件名带md5的文件
+# https://webpack.js.org/guides/caching/
+
+output: {
+  path: path.resolve('dist'),
+  filename: '[name].[chunkhash]_bundle.js'
+}
 ```