Write a getting-started guide that ends in a win

New users install the thing and then don't know what to do next.

Write a getting-started guide for the tool below.

Constraints:
- Define the end state first: the one concrete thing the reader will have working at the end. Pick something small and genuinely useful, not "hello world".
- State the starting assumptions explicitly: what is installed, what account exists, what the reader already knows.
- Every step is a command or an action, followed by what the reader should see. If they will see something confusing but harmless, say so.
- No step may require a decision. Choose defaults for the reader and mention alternatives afterwards.
- Target fifteen minutes. If it cannot fit, cut scope rather than rushing.
- End with a short "what just happened" paragraph and exactly three next steps.

Add a troubleshooting note for the two steps most likely to fail.

Tool:
Reader's starting point:

Getting someone started. READMEs, setup guides, onboarding and glossaries for the person meeting this for the first time.