curl --request POST \
  --url https://api.equos.ai/v3/brains \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "instructions": "<string>",
  "greetingMessage": "<string>",
  "client": "<string>"
}
'

{
  "id": "<string>",
  "organizationId": "<string>",
  "instructions": "<string>",
  "greetingMessage": "<string>",
  "createdAt": "2023-11-07T05:31:56Z",
  "updatedAt": "2023-11-07T05:31:56Z",
  "client": "<string>"
}