README: add note on software development move

README.md

@@ -6,6 +6,8 @@ Nat. Genet., 2016)](cfw.gif)
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+NOTE: December 2024 main software development has moved to [PanGEMMA](https://git.genenetwork.org/pangemma/about/)!
+
 GEMMA is a software toolkit for fast application of linear mixed
 models (LMMs) and related models to genome-wide association studies
 (GWAS) and other large-scale data sets.