doc: Update README.md

Author: jaywcjlove

README.md

@@ -26,6 +26,7 @@
 ✦ 欢迎下载我的 [macOS/iOS](https://wangchujiang.com/#app) 应用程序来支持我，谢谢 ✦
 
 <p style="display: inline-block">
+  <a target="_blank" href="https://wangchujiang.com/focus-cursor/" title="FocusCursor for macOS"><img align="center" alt="FocusCursor" height="52" width="52" src="https://github.com/user-attachments/assets/d543668a-737b-4853-a6bb-eaa269e69836"></a>
   <a target="_blank" href="https://wangchujiang.com/videoer/" title="Videoer for macOS"><img align="center" alt="Videoer" height="52" width="52" src="https://github.com/user-attachments/assets/12c02a7a-109e-4048-91f4-ab2dfd1e264e"></a>
   <a target="_blank" href="https://wangchujiang.com/key-clicker/" title="KeyClicker for macOS"><img align="center" alt="KeyClicker" height="50" width="50" src="https://github.com/user-attachments/assets/5a19fcb9-cb81-4855-b4ea-31c604d9612a"></a>
   <a target="_blank" href="https://wangchujiang.com/daybar/" title="DayBar for macOS"><img align="center" alt="DayBar" height="50" width="50" src="https://github.com/user-attachments/assets/b67d4a2e-92e2-4d8c-8c6f-2a1eb3e2fa93"></a>