Update README.md - project end of life / archival

Author: marc-schwind

README.md

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+# This repository is no longer maintained.
+IBM Cloud Functions reached end of life and this fork is no longer active.
+
+For Apache OpenWhisk visit: [https://github.com/apache/openwhisk](https://github.com/apache/openwhisk).
+
+
+----
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+
 # IBM Cloud Functions Runtime for Python
 
 - The runtime provides [python v3.11](python3.11/) with a set of [python packages](python3.11/requirements.txt), see [python3.11/CHANGELOG.md](python3.11/CHANGELOG.md)