Creates a new contact

Example request

{
  "name": "John Doe",
  "notification_targets": {
    "email": [
      {
        "severity": "HIGH",
        "address": "johndoe@teamrocket.com"
      }
    ],
    "sms": [
      {
        "severity": "HIGH",
        "country_code": "93",
        "number": "111111111",
        "provider": "provider's name"
      }
    ]
  }
}