fix: update command in README for installing agent skill

README.md

@@ -53,7 +53,7 @@ workflows, keeping plaintext file names, contents, and keys off the server.
 You can also use Xdrop through an agent by installing the bundled skill:
 
 ```bash
-npx skills add https://github.com/xixu-me/xdrop/tree/main/skills/xdrop
+bunx skills add https://github.com/xixu-me/xdrop/tree/main/skills/xdrop
 ```
 
 After that, the agent can use Xdrop from the terminal to:

README.zh.md

@@ -52,7 +52,7 @@ Xdrop 是一个开源加密文件传输应用，默认适用于浏览器，也
 你也可以把 Xdrop 作为智能体技能来用，安装存储库自带的 skill：
 
 ```bash
-npx skills add https://github.com/xixu-me/xdrop/tree/main/skills/xdrop
+bunx skills add https://github.com/xixu-me/xdrop/tree/main/skills/xdrop
 ```
 
 安装后，智能体可以直接在终端中使用 Xdrop 来：