Add microsoft implementations and our first sponsor 🥳

I've update the Implementations.md file with Micorsoft's extensions, and Ruff too. Relates to #281

And added a thank you in the README to our first sponsor.

Code review checklist (for code reviewer to complete)

[ ] Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
[ ] Title summarizes what is changing
[ ] Commit messages are meaningful (see this for details)
[ ] Tests have been included and/or updated, as appropriate
[ ] Docstrings have been included and/or updated, as appropriate
[ ] Standalone docs have been updated accordingly
[ ] CONTRIBUTORS.md was updated, as appropriate
[ ] Changelog has been updated, as needed (see CHANGELOG.md)