Update README.md

Author: donaldzou

README.md

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 ### Development on v4
 Hi Everyone, I've decided to promote the long time working `v3.1` to `v4`! This version will be a huge update on the structure of the app. The frontend will be completely handle on the client side with Vue.js, and communicate with the server via REST Api. With this design, it could be possible for the frontend app to connect to multiple server in the future. Stay tune to this new verion, I'm working very hard on this while balancing school and work. If you would like know whats going on, you can check out [this branch](https://github.com/donaldzou/WGDashboard/tree/v4) 😊
 
+#### A preview on v4.0 🥹
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+![v4.0 Preview](https://raw.githubusercontent.com/donaldzou/WGDashboard/main/img/ScreenRecording2024-03-31at12.47.43AM-ezgif.com-video-to-gif-converter.gif)
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 ##### Known issue on WGDashboard `v3.0 - v3.0.6`
 - [IPv6 in WireGuard might not fully support.](https://github.com/donaldzou/WGDashboard/issues/167)
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