chore: set up CHANGELOG

[AngryMaciek]

I see that you stick to major.minor.patch versioning scheme and release new versions of the package.
Thats good!

It would be additionally nice to set up a changelog in CHANGELOG.md file in the root directory, describing features in bullet points. Please take a look here.

Speaking about versioning stuff, I think you could automate the release with this package. That way based on your commits GH would create new releases and then the CI would pick that up and push to PyPI as well.
(But that is a separate issue from the changelog, if you decide to go for it feel free to separate them).

Also, take a look at this commit msg standard: https://www.conventionalcommits.org/en/v1.0.0-beta.2/