Update README.md

DilumAluthge · web-flow · commit 1220a211b33d · 2026-02-24T17:48:52.000-05:00
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 The `ClusterManagers.jl` package implements code for different job queue systems commonly used on compute clusters.
 
+> [!WARNING]
+> Some of the cluster managers in this package are not currently being actively maintained or tested. Please see the tables below to determine which managers are or are not maintained.
+
 ## Available job queue systems
 
 ### In this package
