Create App.js(client)updated code

[Junaid2003]

Updated the code with react router v6

[Junaid2003]

//updated server.js file to latest so that it can work in 2023 hope you can accept pull request. I was not able to commit server.js file so i have pasted the code below.
const express = require("express");
const http = require("http");
const app = express();
const server = http.createServer(app);
const socket = require("socket.io");
const io = socket(server);

const rooms = {};

io.on("connection", socket => {
socket.on("join room", roomID => {
if (rooms[roomID]) {
rooms[roomID].push(socket.id);
} else {
rooms[roomID] = [socket.id];
}
const otherUser = rooms[roomID].find(id => id !== socket.id);
if (otherUser) {
socket.emit("other user", otherUser);
socket.to(otherUser).emit("user joined", socket.id);
}
});

socket.on("offer", payload => {
    io.to(payload.target).emit("offer", payload);
});

socket.on("answer", payload => {
    io.to(payload.target).emit("answer", payload);
});

socket.on("ice-candidate", incoming => {
    io.to(incoming.target).emit("ice-candidate", incoming.candidate);
});

});

server.listen(8000, () => console.log('server is running on port 8000'));