doc: Update README.md

Author: jaywcjlove

README.md

@@ -10,6 +10,7 @@ Render Markdown text in SwiftUI. It is a preview based on the [`Marked`](https:/
 ✦ My macOS/iOS application ✦
 
 <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="52" width="52" 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="52" width="52" src="https://github.com/user-attachments/assets/b67d4a2e-92e2-4d8c-8c6f-2a1eb3e2fa93"></a>