Add initial app screenshot

Author: phpfour

Diff for: README.md

@@ -2,6 +2,10 @@
 
 MoneyMint is a simple app for tracking expenses, budgeting, and getting an overview of your personal finance. It's built upon Laravel ecosystem's two newest members: NativePHP and Livewire v3.
 
+<p align="center">
+  <img alt="MoneyMint" src="https://pbs.twimg.com/media/F1x-uLpaEAAfYhS?format=jpg&name=4096x4096" width="800" style="max-width: 100%;">
+</p>
+
 ## Contributing
 
 Thank you for considering contributing to the project! Please fork this project and open a pull request against the `main` branch.