Create one-off budget

Example request

{
  "amount": {
    "currencyCode": "EUR",
    "scale": 2,
    "unscaledValue": 1050
  },
  "filter": {
    "accounts": [
      {
        "id": "fe34e15244334995bd227e380fcb82fa"
      }
    ],
    "categories": [
      {
        "code": "expenses:food.coffee"
      }
    ],
    "freeTextQuery": "Monmouth Coffee",
    "tags": [
      {
        "key": "coffee"
      }
    ]
  },
  "name": "Coffee budget"
}