core: update readme

Author: simonprovost

README.rst

@@ -1,7 +1,7 @@
 Deep Forest (DF) 21
 ===================
 
-.. note::
+.. 📣 Community Maintained Fork of Deep Forest to support Python 3.10+::
 
    This repository is a community-maintained copy of the original `Deep Forest (DF21) project <https://github.com/LAMDA-NJU/Deep-Forest>`_. We do **not** claim credit for the underlying research or implementation; our goal is to keep the project usable on modern Python versions (e.g., Python 3.10+) while the upstream repository has seen minimal activity since a long time (with one recent try to move to py310+ but with CI/CD failing). If the upstream maintainers prioritise these updates, we are happy to contribute everything back via pull request.