add note to README

[melonora]

Added a note stating the reason for moving xarray-dataclasses to xarray-contrib org.

Summary by Sourcery

Documentation:

• Add a note to README outlining the reason for moving the repository under xarray-contrib and the ongoing effort to secure the original PyPI name

[sourcery-ai]

Reviewer's Guide

The PR modifies README.md by adding an “Important Note” section at the top that explains why the repository was forked into the xarray-contrib organization, acknowledges the original project, and outlines current release status and PyPI naming efforts.

File-Level Changes

Change	Details	Files
Add “Important Note” section to README	Prepend a header and paragraph explaining the fork’s purpose Acknowledge deletion and lack of upstream maintenance Describe intent for community contributions and project stewardship Mention unreleased status and PyPI naming plan	README.md

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[sourcery-ai]

Hey @melonora - I've reviewed your changes and they look great!

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