curl --request POST \
  --url https://api.revring.ai/v1/knowledge-bases/{id}/sources \
  --header 'Content-Type: application/json' \
  --header 'x-api-key: <api-key>' \
  --data '
{
  "sourceType": "text",
  "displayName": "<string>",
  "content": "<string>"
}
'

{
  "data": {
    "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "knowledgeBaseId": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
    "sourceType": "file",
    "displayName": "<string>",
    "status": "queued",
    "createdAt": "2023-11-07T05:31:56Z",
    "updatedAt": "2023-11-07T05:31:56Z",
    "content": "<string>",
    "originalUrl": "<string>",
    "mimeType": "<string>",
    "fileSize": 123,
    "errorMessage": "<string>"
  }
}