Cutiepoka sentinel docs

[cutiepoka]

Description

This is addressing the seeming lack of documentation for sentinel. I spent a week looking at different libraries specifically because I could not find support for sentinel in the first readme, and a number of tickets that were asking for support.
this fixes #2454 #302 #592

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Checklist

• [ x] Does npm test pass with this change (including linting)?
• [ x] Is the new or changed code fully tested?
• [x ] Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

This is a documentation only change.

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Note

Low Risk
Documentation-only updates; no runtime or API behavior changes, with only minor risk of confusion if links/examples are incorrect.

Overview
Adds a new Sentinel section to README.md that points users to the dedicated docs/sentinel.md guide.

Expands docs/sentinel.md with a Client Config section showing how to pass standard client options (e.g., password) via nodeClientOptions when using Sentinel.

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