Merge pull request kubernetes#23719 from metral/corekube

Automatic merge from submit-queue

add CoreKube to community resources

README.md

@@ -150,5 +150,9 @@ That said, if you have questions, reach out to us one way or another.  We don't
 
 You can find more projects, tools and articles related to Kubernetes on the  [awesome-kubernetes](https://github.com/ramitsurana/awesome-kubernetes) list. Add your project there and help us make it better.
 
+* **CoreKube** - [https://corekube.com](https://corekube.com):
+
+Instructive & educational resources for the Kubernetes community. By the community.
+
 
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