freeze

Signed-off-by: Steffen Prohaska <prohaska@zib.de>

README.md

 # Rise Portal (public)
 By Steffen Prohaska
 
+FROZEN 2021-09: The development of Rise Portal ended in 2021.  The staging
+deployment at ZIB has been deleted.  The project repos should be preserved at
+their original location.  The repos should not be deleted before 2026.  The
+repos could be kept forever.  There is no direct follow-up project.  Consider
+adding related information in the future to the ITDS internal repo `rise/rise`.
+
 Repo `rise-pub/rise-portal` contains a subset of repo `rise-portal` in order to
 allow access without login: