npm i
node index
localhost:3001

/user - Get list of all users
/user/id - (number) Get info about user by id
POST /user/id - (number) (id, name, email) Create new user by id ()
PUT /user/id - (json) (id, name, email) Create new user by id
DELETE /user/id - (number) Delete a user by id

/message - Get list of all messages
/message/id - (number) Get message by id
POST /message - (json) (receiverId, senderId, body) Create new message with receiverId, senderId and body of the message
PUT /message/:id - (json) (receiverId, senderId, body) Change message with putted id
DELETE /message/:id - (number) Delete a message by it's id

/phonebook/id - (number) Get list of user's contacts by id (Everyone who contacted him, or he had contact with)