created connection in backend

Signed-off-by: heyhiru <hirentimbadiya74@gmail.com>

server/index.js

@@ -0,0 +1,23 @@
+const { Server, Socket } = require('socket.io');
+
+const io = new Server(8080, {
+    cors: true
+});
+
+
+const emailToSocket = new Map();
+const socketToEmail = new Map();
+
+io.on("connection", (socket) => {
+    console.log(`Socket Connected: ${socket.id}`);
+
+    socket.on('room:join', data => {
+        const { email, room } = data;
+        emailToSocket.set(email, socket.id);
+        socketToEmail.set(socket.id, email);
+
+        // emits a 'room:joined' event back to the client 
+        // that just joined the room.
+        io.to(socket.id).emit('room:join', data);
+    })
+})