Write a tutorial doc

## Description
We need to write up demonstration/tutorial documentation so that operator authors can quickly learn what changes need to be made to begin using the dynamic cache and how to use it.

Start by inspecting the repository's existing documentation and the dynamic cache implementation. Identify the changes operator authors must make and how they use the cache; done means a self-contained tutorial that explains both clearly for new operator authors.

Written by the indexing model from the issue text.