Mention sponsorhsip tier in README

Author: m90

README.md

@@ -78,6 +78,10 @@ docker run --rm \
 
 Alternatively, pass a `--env-file` in order to use a full config as described [in the docs](https://offen.github.io/docker-volume-backup/reference/).
 
+### Looking for help?
+
+In case your are looking for help or guidance on how to incorporate docker-volume-backup into your existing setup, consider [becoming a sponsor](https://github.com/sponsors/offen?frequency=one-time) and book a one hour consulting session.
+
 ---
 
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