Add CI actions link to README

Added a link to the GitHub Actions documentation for continuous integration.

Author: kfcxzaq084

README.md

@@ -1,5 +1,5 @@
 # GitHub Docs <!-- omit in toc -->
-
+actions/automating-builds-and-tests/about-continuous-integration
 Welcome to GitHub Docs! GitHub’s documentation is open source, meaning anyone from inside or outside the company can contribute. For full contributing guidelines, visit our [contributing guide](https://docs.github.com/en/contributing)
 
 ## Quick links by contributor type