Add maintenance mode

README.rst

@@ -8,6 +8,11 @@ jedi-vim - awesome Python autocompletion with VIM
     :target: https://github.com/davidhalter/jedi-vim/actions
     :alt: Tests
 
+**Jedi-VIM has been superseeded by a combination of LSP and Zuban/Jedi with it, I
+generally advise people to use [Zuban](http://github.com/zubanls/zuban),
+because it fixes a lot of issues Jedi has with typing and is 10x-100x faster.
+Jedi-vim is in maintenance-mode and new features will likely not be added.**
+
 jedi-vim is a VIM binding to the autocompletion library
 `Jedi <http://github.com/davidhalter/jedi>`_.