Add end to end usage example for file configuration

[jack-berg]

We should add end to end usage examples to the file configuration document to make it clear how the APIs are intended to be used.

Would an example in this section be appropriate? It might help make it more clear how a Configurer would be instantiated and used

Originally posted by @codeboten in #3437 (comment)

[tigrannajaryan]

@jack-berg do you plan to work on this or we need help?

[jack-berg]

I plan on working on it. I've assigned myself.