Modern Full-Stack Development

 Adding  a Contact
To add a contact, the aptly named addContact() method is called, accepting an object 
adhering to the IContact interface:
Chapter 9   Delivering the gooDs: MailBag, the Client

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public async addContact(inContact: IContact):
  Promise {
  const response: AxiosResponse = await axios.post(
    `${config.serverAddress}/contacts`, inContact
  );
  return response.data;
}
Once more, it’s a simple Axios call, this time a post(), passing inContact as the 
second argument. Axios takes care of serializing that to JSON and sending it in the 
request body for us. We get back the same object but now with the _id field added, so 
that is returned so the caller can add it to the list of contacts for display (we’ll get into all 
of that later).