Add a new sponsorship

curl --request POST \
  --url https://api.helpyousponsor.com/v1/admin/sponsorships \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '{
  "donors": 1,
  "id": 1,
  "sp_amount": "100",
  "client_id": "1",
  "entity_id": 1,
  "entities": 1,
  "method": "3",
  "frequency": "1",
  "next": "2023-11-25"
}'

{
  "message": "Sponsorship relationship successfully created."
}