Update readme

Author: tonymeehan

README.md

@@ -4,7 +4,9 @@
 
 [Documentation](https://docs.prequel.dev) | [Slack](https://inviter.co/prequel) | [Playground](https://play.prequel.dev/) | [Mailing List](https://www.detect.sh)
 
+[![Unit Tests](https://github.com/prequel-dev/cre/actions/workflows/build.yml/badge.svg)](https://github.com/prequel-dev/cre/actions/workflows/build.yml)
 [![Unit Tests](https://github.com/prequel-dev/preq/actions/workflows/build.yml/badge.svg)](https://github.com/prequel-dev/preq/actions/workflows/build.yml)
+[![Unit Tests](https://github.com/prequel-dev/prequel-compiler/actions/workflows/build.yml/badge.svg)](https://github.com/prequel-dev/prequel-compiler/actions/workflows/build.yml)
 
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