DOC add changelog to docs

[adrinjalali]

This is the initial changelog, we don't have to be detailed here since it's the first release.

cc @skops-dev/maintainers

[BenjaminBossan]

Looks good. Do we expect contributors to add to the changes.rst or do we collect all changes ourselves before the release? If the former, we should also amend the CONTRIBUTING.rst.

Do we want to later differentiate between kinds of changes, e.g. features vs bugfix vs breaking changes etc.?

[adrinjalali]

If the former, we should also amend the CONTRIBUTING.rst.

Added authors, refinements to the contributing guide is coming in a separate PR.

Looks good. Do we expect contributors to add to the changes.rst or do we collect all changes ourselves before the release?

I also rather each PR add their line in the changelog.

Do we want to later differentiate between kinds of changes, e.g. features vs bugfix vs breaking changes etc.?

We can differentiate between those different types of changes, don't mind.

[merveenoyan]

LGTM 🌟