curl --request POST \
  --url https://api.landing.ai/v1/projects/{project_id}/classes \
  --header 'Content-Type: application/json' \
  --data '{}'

{
  "data": [
    {
      "id": 123,
      "name": "<string>",
      "index": 123,
      "color": "<string>",
      "description": "<string>"
    }
  ]
}