[ Resources Quota Lecure] Add a useful command for valdiation

Just after running `kubectl -n cpu-limited-tomcat get resourcequota`, we can run the describe command:

```sh
kubectl -n cpu-limited-tomcat describe resourcequotas compute-resources
```

### Related Lecture: 

https://www.udemy.com/kubernetes-from-a-devops-kubernetes-guru/learn/v4/t/lecture/9671576?start=0