docs: document dumi dev server port

Author: afc163

README.md

@@ -6,7 +6,6 @@
 
 <p align="center">English | <a href="./README.zh-CN.md">简体中文</a></p>
 
-
 <div align="center">
 
 [![NPM version][npm-image]][npm-url]
@@ -18,7 +17,6 @@
 
 </div>
 
-
 ## Highlights
 
 - Textarea mentions with prefix based search and selection.
@@ -159,6 +157,8 @@ npm run compile
 npm run build
 ```
 
+The dumi site runs at `http://localhost:8000` by default.
+
 ## Release
 
 ```bash

README.zh-CN.md

@@ -157,6 +157,8 @@ npm run compile
 npm run build
 ```
 
+dumi 站点默认运行在 `http://localhost:8000`。
+
 ## 发布
 
 ```bash