GET localhost:3000/user - get all users
GET localhost:3000/user/:id - get unique user
GET localhost:3000/user/:id/chat-with - get all users with :id user is chatting
POST localhost:3000/user - add new user
PUT localhost:3000/user/:id - update user
DELETE localhost:3000/user/:id - delete user
GET localhost:3000/message - get all messages
GET localhost:3000/message/:id - get unique message
POST localhost:3000/message - add new message
PUT localhost:3000/message/:id - update message
DELETE localhost:3000/message/:id - delete message