Document exposing EL with openshift route

Added Openshift Route Doc for exposing eventlistener.
Also, modified command in existing document to get service name.

docs/exposing-eventlisteners.md

@@ -24,11 +24,11 @@ Instructions for installing nginx Ingress on other Kubernetes services can be fo
       kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/mandatory.yaml
       kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/master/deploy/static/provider/cloud-generic.yaml
     ```
-1. Find the service name expose by the GitHub service:
+2. Find the service name expose by the Eventlistener service:
     ```sh
-     kubectl get el -o=jsonpath='{.status.configuration.generatedName} <EVENTLISTENR_NAME> '
+     kubectl get el <EVENTLISTENR_NAME> -o=jsonpath='{.status.configuration.generatedName}'
     ```
-1. Create the Ingress resource. A sample Ingress is below. Check the docs [here](https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/)
+3. Create the Ingress resource. A sample Ingress is below. Check the docs [here](https://kubernetes.github.io/ingress-nginx/user-guide/nginx-configuration/)
 for a full range of configuration options.
     ```YAML
     apiVersion: extensions/v1beta1
@@ -49,5 +49,25 @@ for a full range of configuration options.
               servicePort: 8080
     ```
 
-1. Try it out! Get the address of the Ingress by running `kubectl get ingress ingress-resource` 
+4. Try it out! Get the address of the Ingress by running `kubectl get ingress ingress-resource` 
 and noting the address field. You can `curl` this IP or setup a GitHub webhook to send events to it.
+
+## Using Openshift Route
+
+The following instructions have been tested on Openshift 4.2 cluster running version `v1.14.6+32dc4a0`.
+Further information can be found [here](https://docs.okd.io/latest/architecture/networking/routes.html) 
+
+1. Find the service name expose by the Eventlistener service:
+    ```sh
+     oc get el <EVENTLISTENR_NAME> -o=jsonpath='{.status.configuration.generatedName}'
+    ```
+2. Expose the service using openshift route:
+    ```sh
+     oc expose svc/[el-listener] # REPLACE el-listener WITH YOUR SERVICE NAME FROM STEP 1
+     ```
+3. Get the address of the Openshift Route:
+    ```sh
+     oc get route el-listener  -o=jsonpath='{.spec.host}' # REPLACE el-listener WITH YOUR SERVICE NAME FROM STEP 1
+     ```
+4. Try it out! You can use the url received above to setup a GitHub webhook for receiving events or you can `curl` this url.
+