Add link to deprecation blog

README.md

@@ -1,3 +1,7 @@
+# This install method has been deprecated.
+
+## https://www.home-assistant.io/blog/2020/05/09/deprecating-home-assistant-supervised-on-generic-linux/
+
 # Install Home Assistant Supervised
 
 As an alternative to using the images which include the Home Assistant operating-system and Docker, it is also possible to run Home Assistant on a generic system running another Linux of your choice such as Ubuntu, Debian, etc as Supervised. Because of all the various possible install options, these are more of a community supported installation choice. It follows that the more esoteric of a choice made with the OS, the less a user will find in terms of information and support from the community.