Add Usage information and code samples to README

[mpospese]

Intro

Our README should contain all necessary summary information about our framework. Currently we're missing usage information.

Task

Copy the usage information from this Notion page (restricted) into the README. Add a new h2 section "Usage" and place that information within (using h3 and h4 subsections as appropriate). The "Usage" section should be between "Documentation" and "Installation". Do not copy over the section with the video links (because those are private).

AC

• README updated with all usage information