docs: update maintenance status

README.md

@@ -16,6 +16,10 @@
 `pv-migrate` is a CLI tool/kubectl plugin to easily migrate 
 the contents of one Kubernetes `PersistentVolumeClaim` to another.
 
+⚠️ **Maintenance status**:
+I get that it can be frustrating not to hear back about the stuff you've brought up or the changes you've suggested. But honestly, for over a year now, I've hardly had any time to keep up with my personal open-source projects, including this one. I am still committed to keep this tool working and slowly move it forward, but please bear with me if I can't tackle your fixes or check out your code for a while. Thanks for your understanding.
+
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 ## Demo
 
 ![pv-migrate demo GIF](img/demo.gif)