Improve README quickstart for first-time users

[kmadan]

Goal

Make the README quickstart frictionless for someone who has never seen AICertify before. They should be able to run an evaluation and look at a report within five minutes.

Why this matters

The README quickstart currently assumes the reader knows what a 'contract' is, that OPA is in the picture, and that they want a PDF report. New visitors need a shorter ladder.

Files likely involved

• README.md (Quick Start section)
• Possibly examples/quickstart.py (small clarifications)
• Possibly docs/INDEX.md

Acceptance criteria

• A copy-paste quickstart that runs to a generated report in under five commands
• One screenshot or short PDF link of the resulting report visible inline
• No assumed OPA or Rego knowledge for the first run
• An explicit 'Now adapt it' callout pointing at the example directories
• Optionally: a 30–60 second asciinema or screen recording embedded as a GIF

Help

Comment here if you want to work on this and I will help you get started. First-time contributors are welcome — open a draft PR early and I'll review.