🌐 docs: 添加英文文档

example/docs/guide/custom-footer.en-US.md

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+---
+order: 2
+title: Custom Footer
+group:
+title: Configuration
+order: 4
+---
+
+# Custom Footer
+
+Based on dumi's good theme architecture, we can easily customize the Footer of our site.
+
+The Footer in this theme package is based on [rc-footer](https://github.com/react-component/footer) encapsulation. Therefore, this Footer component can support icons and other React components. This makes it impossible to configure the Footer column in the `themeConfig` and requires custom props to be passed into the Footer component.
+
+Create a `.dumi/theme/slots` directory in your project and then create a `Footer` component in that directory with the following content:
+
+```tsx | pure
+//.dumi/theme/slots/Footer/index.tsx
+
+import { Footer } from 'dumi-theme-antd-style';
+
+export default () => {
+  return <Footer bottom={'Customized'} />;
+};
+```
+
+The resulting code block looks like this:
+
+```tsx
+import { Footer } from 'dumi-theme-antd-style';
+
+export default () => {
+  return <Footer bottom={'Customized'} />;
+};
+```
+
+If you need to customize the columns, please refer to the Footer [source code](https://github.com/arvinxx/dumi-theme-antd-style/blob/master/src/slots/Footer/index.tsx) reference in this theme.