Add entries to a dataset

curl --request POST \
  --url https://app.langwatch.ai/api/dataset/{slug}/entries \
  --header 'Content-Type: application/json' \
  --header 'X-Auth-Token: <api-key>' \
  --data '{
  "entries": [
    {
      "input": "hi",
      "output": "Hello, how can I help you today?"
    }
  ]
}'