Update README.rst to mention NumFocus

Author: apdavison

README.rst

@@ -27,6 +27,7 @@ Neo objects behave just like normal NumPy arrays, but with additional metadata,
 checks for dimensional consistency and automatic unit conversion.
 
 A project with similar aims but for neuroimaging file formats is `NiBabel`_.
+Neo is a `NumFocus Affiliated Project`_.
 
 Code status
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@@ -82,3 +83,4 @@ and by the European Union's Research and Innovation Program Horizon Europe Grant
 .. _`issue tracker`: https://github.c
 .. _tridesclous: https://github.com/tridesclous/tridesclous
 .. _ephyviewer: https://github.com/NeuralEnsemble/ephyviewer
+.. _`NumFocus Affiliated Project`: https://numfocus.org/sponsored-projects/affiliated-projects