Cosmic Unicorn: add link

micropython/examples/cosmic_unicorn/README.md

@@ -185,3 +185,4 @@ Here are some cool Cosmic Unicorn community projects and resources that you migh
 - :link: [Green Energy Display with Cosmic Unicorn](https://www.hackster.io/andreas-motzek/clock-and-green-energy-display-with-cosmic-unicorn-641dcb)
 - :link: [cosmic-emoji-react - paint emojis from a computer, phone or tablet](https://github.com/chriscareycode/cosmic-unicorn/tree/main/cosmic-emoji-react)
 - :link: [cosmic-paste - paste images from the clipboard to Cosmic Unicorn](https://github.com/chriscareycode/cosmic-unicorn/tree/main/cosmic-paste)
+- :link: [Halloweenicorn - PIR enabled scarer](https://github.com/mrglennjones/Halloweenicorn)