HelloWorld 文件名原因，项目启动报错

你好，最近正在使用该项目学习 ant-design，该项目拉下来以后没有办法直接 `cnpm run dev` 启动。

查看了一下 config/config.js 中配置的 helloworld 路由找不到对应文件：
* 配置的 `HelloWorld` 和 src/page/helloworld.js 文件没有匹配上

Start by comparing the route configuration in config/config.js with src/page/helloworld.js, focusing on the HelloWorld versus helloworld name mismatch. Run cnpm run dev to reproduce the startup failure; done means the configured route resolves to the existing page and the project starts successfully.

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