Add example instances of example schemas

[cmungall]

This repo uses the linkml-example-runner framework, including examples of the schema, and testing those examples

https://github.com/linkml/linkml-model/tree/main/tests/input/examples

but this repo is special - it is a metamodel, so we need to go one level down, for each example schema, we want to include example instances

[Silvanoc]

@nlharris why is this issue here? You moved it to linkml/linkml (where IMO it was expected) and then back here.

[nlharris]

I don't remember. Maybe I was asked to move it back?

[Silvanoc]

I don't remember. Maybe I was asked to move it back?

I don't really care. It's just a heads-up 🙂