curl --request POST \
  --url https://api.backside.app/api/v1/projects/{id}/milestones \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "name": "<string>",
  "description": "<string>",
  "position": 123,
  "status": "<string>",
  "target_date": "2023-12-25"
}
'

{
  "created_at": "2023-11-07T05:31:56Z",
  "id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "metadata": "<unknown>",
  "name": "<string>",
  "position": 123,
  "project_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "status": "<string>",
  "tenant_id": "3c90c3cc-0d44-4b50-8888-8dd25736052a",
  "updated_at": "2023-11-07T05:31:56Z",
  "description": "<string>",
  "target_date": "2023-12-25"
}