* Provide example to utilize k8s_external plugin
The example provides a specific use case of k8s_external and may help others to grasp `k8s_external`'s capabilities.
* Update plugin/k8s_external/README.md
Co-Authored-By: Chris O'Haver <cohaver@infoblox.com>
* Update plugin/k8s_external/README.md
Co-Authored-By: Chris O'Haver <cohaver@infoblox.com>