📝 Docs: Create and update CHANGELOG.md using changelog-from-release

[sayalaruano]

Summary

Create CHANGELOG.md using the changelog-from-release tool, and add a GitHub action workflow to update it automatically after every new release.

List of changes proposed in this PR (pull-request)

• Generated CHANGELOG.md file.
• Updated cdci.yml GitHub action with a workflow to update the changelog automatically after every new release.
• Update README.md with info about commit conventions and changelog.
• Add CHANGELOG.md to the docs.