Add a CHANGELOG.md

[shawnzhu]

From @epeters3

Idea: Include a Changelog page or a "What's New in Chroma" section on the home page of the Chroma site that allows consumers to see what's new.

I've seen some OSS repos automated changelog.md updates as part of release process via github actions. comments are welcome

[epeters3]

I've seen some OSS repos automated changelog.md updates as part of release process via github actions. comments are welcome

I like this idea since it largely automates the process. We could add a semantic release workflow along with the GitHub action to automatically update CHANGELOG.md. Also there are Storybook integrations for rendering markdown files and changelog files.