Initialize React app in client folder for frontend setup

- Created a new React application in the client directory to serve as the frontend for the project.
- Set up necessary files and dependencies for the React app, enabling a structured frontend environment.
- Updated project structure to support a full-stack setup with separate client and server codebases.

This addition provides the foundational setup for the React frontend, facilitating the build and deployment process.

Author: KazerL

client/.gitkeep

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