Update README with a GIF for the Expo CloudSync example

Author: Gioee

examples/to-do-app/README.md

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 A simple Expo example demonstrating SQLite synchronization with CloudSync. Build cross-platform apps that sync data seamlessly across devices.
 
+<img src="https://github.com/user-attachments/assets/45302aa5-d1d2-444a-a3c4-119a26b264e4" width="40%" height="40%">
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 ## 🚀 Quick Start
 
 ### 1. Clone the template