Update Readme

Author: deanilla

README.md

@@ -27,6 +27,9 @@ We're gonna use a pointing device that we're all born with — our fingers."</em
 <p align="center">— Steve Jobs, Macworld 2007: The iPhone Introduction</p>
 
 
+![AirCursor Demo](demo.gif)
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 ## Overview
 
 For decades, the mouse, touchpad, keyboard, and screen have dominated human-computer interaction. While these tools are effective, prolonged use can be tiresome, and they may feel limiting in an era of rapid technological advancement. What if you could control your computer with simple hand gestures in the air? Inspired by this vision—and recent AR innovations—I created **AirCursor**, a gesture-controlled mouse application.

README_zh_CN.md

@@ -26,6 +26,9 @@ style="margin: 0 10px;" >中文</span>
 <p align="center"><strong>— 史蒂夫·乔布斯, 2007 iPhone 发布会</strong></p>
 
 
+![AirCursor Demo](demo.gif)
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 ## 概览
 
 数十年来，鼠标、键盘和屏幕一直是人机交互的主要方式。尽管这些工具十分高效，但长期使用易致疲劳。随着技术的飞速发展，这些彼时的革命性创新也稍显局限。如果可以通过简单的空中手势控制电脑，那将怎样？受此愿景和最近 AR 领域的创新启发，我开发了 **AirCursor**，一款基于手势控制的鼠标应用。