Add changelog update process to repository docs

[nanaf6203-bit]

Describe how to update changelog entries for releases.

Acceptance Criteria:

• Docs explain changelog format and location.
• Release process notes are included.
• Examples are provided.
• Workflow is documented for contributors.

[Valreb001]

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Good day, maintainer I would like to work on this issue, assign me

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[brite-side0]

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[dotmantissa]

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[Swayymalcolm99]

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[Johnjnr1]

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[code-0-stella]

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[ummarig]

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As a full stack developer with years of experience assigning this task to me will amount to the job done

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[drips-wave]

Congratulations, @ummarig! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 2, 2026.

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