feat: Add JWT for Authentication and Authorization

[Rishav1707]

Add the JWT support for Authentication and Authorization.

• Now the user token is stored in the localstorage irrespective of all the user details.
• Secured route is present which verify the token in order to make the user authentic.
• Middlewares is also present in order to verify the end user.

Reference

https://github.com/koolkishan/chat-app-react-nodejs/assets/97666287/6b08130e-f1e5-468b-83cd-0bce1e9f2cb4

Solved the issue #10