Add Dark Mode feature

[ishi142005]

Added a Dark Mode feature by adding DarkMode.js.
Darkmode.js:-
import React, { useEffect, useState } from 'react';

const DarkMode = () => {
// Initialize state from localStorage
const [theme, setTheme] = useState(localStorage.getItem('theme') || 'light');
// Set the theme on page load
useEffect(() => {
document.documentElement.setAttribute('data-theme', theme);
}, [theme]);
// Toggle the theme between dark and light
const toggleTheme = () => {
const newTheme = theme === 'dark' ? 'light' : 'dark';
setTheme(newTheme);
localStorage.setItem('theme', newTheme);
};
return (

Toggle Dark Mode

);
};
export default DarkMode;