add extension readme

Author: JusterZhu

website/i18n/en/docusaurus-plugin-content-docs/current/doc/GeneralUpdate.PacketTool.md

@@ -14,11 +14,14 @@ This tool is developed using Avalonia and supports Windows / Linux / Mac desktop
 | ------------------------------- | --------- | ------------------------------------------------------------ |
 | Build patch package             | Yes       | Compares the previous version with the current version to identify updated, newly added, or deleted files. |
 | Build OSS version configuration | Yes       | Easily generates OSS version configuration files.            |
+| Build Extension package         | Yes       |                                                              |
 
 ![](imgs\tool.png)
 
 ![](imgs\tool2.png)
 
+![](imgs\tool3.png)
+
 #### Explanation
 
 **Build Patch Package**