getUser

• code: String – Http code.
• msg: String – Response message.
• object: Object – Object representing the system user.
    o id: Long – System user ID
    o firstName: String – First name.
    o lastName: String – Last name.
    o lastLogin: Date – Last login date.

{
    "code": "200",
    "msg": "User found.",
    "object": {
        "id": 3,
        "firstName": "Edgar",
        "lastName": "Salas",
        "lastLogin": null
    }
}