Examples / Usage docs for prime_analytics

A usage / example doc to be created in a new `/docs/usage` folder, the doc would have an example script or a snippet with an example input and output to showcase the usage of the task.

Start by locating the prime_analytics task implementation and checking whether the repository has existing documentation or example conventions. Create the requested /docs/usage documentation with an example script or snippet, including representative input and output; the task's usage should be understandable from the finished page.

Written by the indexing model from the issue text.