Add monetary price and currency

[jannahastings]

Add 'monetary price' and 'currency' with the definitions 'A monetary price is a quantity value that describes the amount of money requested, expected, required or given in exchange for something else.' and 'A unit which is a measure of the medium of an exchange value, defined by reference to the geographical location of the monetary authorities responsible for it.' respectively as per the FIBO sheet.

Closes #331

[akleinau]

About the definition of monetary price: A monetary price is more concretely an economic value, quantity value is the superclass of economic value.

[jannahastings]

About the definition of monetary price: A monetary price is more concretely an economic value, quantity value is the superclass of economic value.

Good catch. Now fixed in definition.

[sfluegel05]

You added a FIBO-reference for currency, but not for monetary price (https://spec.edmcouncil.org/fibo/ontology/FND/Accounting/CurrencyAmount/Price).

Also, could you update the changelog for this pr and the others as well?

[jannahastings]

You added a FIBO-reference for currency, but not for monetary price (https://spec.edmcouncil.org/fibo/ontology/FND/Accounting/CurrencyAmount/Price).

Reference now added.

Also, could you update the changelog for this pr and the others as well?

Changelog now updated.

[sfluegel05]

Now everything looks fine to me. Thanks for implementing!