Update README.md - project eol

Author: marc-schwind

README.md

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+# This repository is no longer maintained.
+IBM Cloud Functions reached end of life and this repository is no longer active.
+
+For Apache OpenWhisk visit: [https://github.com/apache/openwhisk](https://github.com/apache/openwhisk).
+
+---
+
+
 # IBM Cloud Functions runtime for swift
 
 [![Build Status](https://travis-ci.org/ibm-functions/runtime-swift.svg?branch=master)](https://travis-ci.org/ibm-functions/runtime-swift)