curl --request POST \
  --url https://api.example.com/themes \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "color": "<string>"
}
'

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