Creates a cause

curl --request POST \
  --url https://api.rootly.com/v1/causes \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/vnd.api+json' \
  --data '
{
  "data": {
    "type": "causes",
    "attributes": {
      "name": "<string>",
      "description": "<string>",
      "position": 123
    }
  }
}
'

{
  "data": {
    "id": "9a5988d4-29d3-4e2b-9ad9-8a260f8ab813",
    "type": "causes",
    "attributes": {
      "slug": "how-to-handle-customer-facing-incident",
      "name": "How to handle customer-facing incident?",
      "description": "This is a description",
      "position": 1,
      "created_at": "2025-12-10T06:08:09.751-08:00",
      "updated_at": "2025-12-10T06:08:09.751-08:00"
    }
  }
}