Documentation: Request for example file

[dizzzz]

It would be rather beneficial to have an example resolver.properties file with al configurable items in it.

The format I really 'like' is the format where all configurable items are present, commented out, with the default value, for example:

## xmlresolver.properties

#access-external-document=all
#access-external-entity=all
#classpath-catalogs=??
#prefer=??
#always-resolve=??

For "??" it is unclear what the default value is; Please could you add this to https://xmlresolver.org/ch06 ?