Clear release notes

[llucax]

No description provided.

[Copilot]

Pull Request Overview

This PR adds a structured template for release notes by introducing new sections and placeholder comments to be filled with actual content.

• Added Summary and Upgrading sections with initial placeholders.
• Created sub-sections for Cookiecutter template guidance under both Upgrading and New Features.
• Expanded Bug Fixes section with placeholders for notable fixes.

Comments suppressed due to low confidence (7)

RELEASE_NOTES.md:5

• Replace this placeholder with a concise summary of the release’s purpose and key highlights.

<!-- Here goes a general summary of what this release is about -->

RELEASE_NOTES.md:9

• Fill in upgrade instructions, detailing any breaking changes, deprecations, and the recommended migration path.

<!-- Here goes notes on how to upgrade from previous versions, including deprecations and what they should be replaced with -->

RELEASE_NOTES.md:21

• Provide specific Cookiecutter migration steps or examples to guide users through template changes.

<!-- Here upgrade steps for cookiecutter specifically -->

RELEASE_NOTES.md:25

• List and describe the primary new features, including usage examples or configuration notes.

<!-- Here goes the main new features and examples or instructions on how to use them -->

RELEASE_NOTES.md:29

• Add details about Cookiecutter-specific new features, including any template parameter updates.

<!-- Here new features for cookiecutter specifically -->

RELEASE_NOTES.md:33

• Replace this placeholder with explanations for any significant bug fixes or changes in behavior.

<!-- Here goes notable bug fixes that are worth a special mention or explanation -->

RELEASE_NOTES.md:37

• Document any Cookiecutter-specific bug fixes, including before/after behaviors if relevant.

<!-- Here bug fixes for cookiecutter specifically -->