Create Population

{
  "data": {
    "id": "<string>",
    "avg_mean_absolute_error": 123,
    "avg_mean_squared_error": 123,
    "avg_normalised_kullback_leibler_divergence": 123,
    "created_at": "2023-11-07T05:31:56Z",
    "description": "<string>",
    "name": "<string>",
    "public": true,
    "question_count": 123,
    "reality_target": "<string>",
    "simulacrum_count": 123,
    "simulation_engine": "<string>",
    "status": "<string>",
    "test_finished_at": "2023-11-07T05:31:56Z",
    "test_started_at": "2023-11-07T05:31:56Z",
    "upload_filename": "<string>"
  },
  "errors": [
    {
      "code": "<string>",
      "message": "<string>"
    }
  ]
}