chore: update readme with settings

[Ian2012]

Merge checklist:
Check off if complete or not applicable:

• Version bumped
• Changelog record added
• Documentation updated (not only docstrings)
• Fixup commits are squashed away
• Unit tests added/updated
• Manual testing instructions provided
• Noted any: Concerns, dependencies, migration issues, deadlines, tickets

[openedx-webhooks]

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[github-actions]

Coverage report

This PR does not seem to contain any modification to coverable code.

[openedx-webhooks]

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