Jest+React-testing-library Integeration

# Integrate Jest for Testing React Components

## Problem Statement
Currently, the project lacks a testing framework for React components. Without automated tests, maintaining code quality, detecting regressions, and ensuring reliable functionality is challenging, especially as the project scales.

## Proposed Solution
Integrate Jest as the testing framework for the React components. Jest is a widely-used testing library in the React ecosystem that offers the following benefits:
- **Snapshot testing**: Ensures the UI doesn't change unexpectedly.
- **Mocking capabilities**: Enables isolating components for focused testing.
- **Rich ecosystem**: Works seamlessly with React Testing Library for testing DOM interactions.

## Steps to Integrate Jest
1. Install Jest and React Testing Library as dev dependencies:
```bash
npm install --save-dev jest @testing-library/react @testing-library/jest-dom @testing-library/user-event