Add resources

README.md

@@ -52,3 +52,11 @@ Read over the following articles to learn how to deploy this web site to Surge.
 - [Remembering a domain](http://surge.sh/help/remembering-a-domain)
 
 A good domain name for this project is `USERNAME-pixel-art-maker.surge.sh` where `USERNAME` is your GitHub username in all **lowercase** letters. Once deployed and everything works as you expect, copy your Surge URL and paste it at the top of your GitHub repository's page.
+
+### Resources
+
+- [addEventListener](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget/addEventListener)
+- [className](https://developer.mozilla.org/en-US/docs/Web/API/Element/className)
+- [style](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/style)
+- [querySelector](https://developer.mozilla.org/en-US/docs/Web/API/Document/querySelector)
+- [appendChild](https://developer.mozilla.org/en-US/docs/Web/API/Node/appendChild)