Update README.md

Author: Mishra-coder

README.md

@@ -8,6 +8,7 @@ Built with a modern MERN stack on the backend and React + React Native on the fr
 
 - **Website:** [zappify-sepia.vercel.app](https://zappify-sepia.vercel.app)
 - **Download APK:** [Zappify Android App](https://expo.dev/accounts/devendra.mi/projects/zappify/builds/29e30585-c692-470b-b195-fd7af1822eb2)
+- **Preview App:** [Preview App](https://drive.google.com/file/d/1IDo1ueM5tcDFiFk4r-4q5vFa-vUeZcyl/view)
 
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