Another serverless library.

README.md

 *Libraries and tools to help build serverless web applications.*
 
 * [Bref](https://bref.sh/) - Serverless PHP on AWS Lambda.
+* [OpenWhisk](http://openwhisk.apache.org/) - An open source serverless cloud platform.
 * [Serverless Framework](https://serverless.com/framework/) - An open source framework for building serverless applications.
 
 ## Configuration