KDL examples to go with KDL schema example(s)

[micahsnyder]

The example schema at https://github.com/kdl-org/kdl/blob/main/examples/kdl-schema.kdl would be easier to grok if there were a corresponding kdl file or two that fits the schema. It could maybe go at the top of the schema in a comment block for easy reference.

It would be even better if we could add some markdown documentation with schema/kdl examples in pairs.

I'm only just starting to play with KDL so I'm not able to contribute this myself (yet).

[boringcactus]

That schema corresponds to the KDL Schema specification, so the document that fits that schema is itself.