Create Authorization JWT

[Chuan-Chen]

Using JWT to create auth for server and client.

• [ ] Add JWT and use it to authenticate client to filter content
• [ ] Make sure client can be authenticated using JWT

[shino022]

signup and login apis are implemented but the password still needs to be hashed, when the password is saved and validated we also need to implement a middleware, when the user access to the private route, it needs to authenticate the jwt from the user

I added a diagram to see the backend file structuer https://github.com/TheIndieDevs/Blog/tree/create-jwt/server#readme