Update README with Cloudfest Hackathon contributors list.

Author: zzap

README.md

@@ -62,6 +62,19 @@ Want to contribute a new feature? Please first [open a new issue](https://github
 
 Once you've decided to commit the time to seeing your pull request through, [please follow our guidelines for creating a pull request](https://make.wordpress.org/cli/handbook/pull-requests/) to make sure it's a pleasant experience. See "[Setting up](https://make.wordpress.org/cli/handbook/pull-requests/#setting-up)" for details specific to working on this package locally.
 
+### Cloudfest Hackathon Contributors
+
+- Pascal Birchler - @swissspidy
+- Jan-Willem Oostendorp - @janw-me/
+- Joost de Valk - @jdevalk
+- Marco Chiesi - @marcochiesi
+- Matt Biscay - @skyminds
+- Moritz Bappert - @moritzbappert
+- James Hunt - @thetwopct
+- Tome Pajkovski - @tomepajk
+- David Mosterd - @davidmosterd
+- Milana Cap - @zzap
+
 ## Support
 
 GitHub issues aren't for general support questions, but there are other venues you can try: https://wp-cli.org/#support