====== Clase a partir de JSON ======
Usaremos el siguiente JSON de ejemplo obtenido de https://www.objgen.com/json?demo=true:
<code>
{
  "product": "Live JSON generator",
  "version": 3.1,
  "releaseDate": "2014-06-25T00:00:00.000Z",
  "demo": true,
  "person": {
    "id": 12345,
    "name": "John Doe",
    "phones": {
      "home": "800-123-4567",
      "mobile": "877-123-1234"
    },
    "email": [
      "jd@example.com",
      "jd@example.org"
    ],
    "dateOfBirth": "1980-01-02T00:00:00.000Z",
    "registered": true,
    "emergencyContacts": [
      {
        "name": "Jane Doe",
        "phone": "888-555-1212",
        "relationship": "spouse"
      },
      {
        "name": "Justin Doe",
        "phone": "877-123-1212",
        "relationship": "parent"
      }
    ]
  }
}
</code>