Updating README for information on OpenShift (ko-build#346)

- Spellings and formatting from @imjasonh

Signed-off-by: Chmouel Boudjnah <chmouel@chmouel.com>

README.md

@@ -373,6 +373,26 @@ Yes! `ko resolve -f -` will read and process input from stdin, so you can have
 kustomize build config | ko resolve -f -
 ```
 
+## Does `ko` work with [OpenShift Internal Registry](https://docs.openshift.com/container-platform/4.7/registry/registry-options.html#registry-integrated-openshift-registry_registry-options)?
+
+Yes! Follow these steps:
+
+* Connect to your OpenShift installation: https://docs.openshift.com/container-platform/4.7/cli_reference/openshift_cli/getting-started-cli.html#cli-logging-in_cli-developer-commands
+* Expose the OpenShift Internal Registry so you can push to it: https://docs.openshift.com/container-platform/4.7/registry/securing-exposing-registry.html
+* Export your token to `$HOME/.docker/config.json`:
+
+```sh
+oc registry login --to=$HOME/.docker/config.json
+```
+
+* Create a namespace where you will push your images, i.e: `ko-images`
+* Execute this command to set `KO_DOCKER_REPO` to publish images to the internal registry.
+
+```sh
+   export KO_DOCKER_REPO=$(oc get route default-route -n openshift-image-registry --template='{{ .spec.host }}')/ko-images
+```
+
+
 # Acknowledgements
 
 This work is based heavily on learnings from having built the