doc: Update README.md

jaywcjlove · jaywcjlove · commit eaa44a5dd25b · 2022-03-14T19:48:56.000+08:00
diff --git a/README.md b/README.md
@@ -13,7 +13,7 @@ React component preview markdown text in web browser. The minimal amount of CSS
 
 ## Features
 
-- 🌒 Support dark-mode/night mode. `@v4`
+- 🌒 Support dark-mode/night-mode. `@v4`
 - 🙆🏼‍♂️ GitHub style: The markdown content is rendered as close to the way it's rendered on GitHub as possible.
 - 🏋🏾‍♂️ Support [GFM](https://github.github.com/gfm/) (autolink literals, footnotes, strikethrough, tables, tasklists).
 - 🍭 Support automatic code block highlight.
@@ -140,6 +140,19 @@ Here is a simple footnote[^1]. With some additional text after it.
 [^1]: My reference.
 ```
 
+## Support dark-mode/night-mode
+
+By default, the `dark-mode` is automatically switched according to the system. If you need to switch manually, just set the `data-color-mode="dark"` parameter for body.
+
+```html
+<body data-color-mode="dark"></body>
+```
+
+```js
+document.body.setAttribute('data-color-mode', 'dark')
+document.body.setAttribute('data-color-mode', 'light')
+```
+
 ## Development
 
 Runs the project in development mode.  
