Create or revise task for creating a gateway

While Daniel and I were working on something we had a hard time finding the topic that describes creating a gateway. Creating this story to go back and explore if we can revise an existing topic or create a new one for the gateway creation workflow.

We might want to include gateway injection information.

https://docs.openshift.com/container-platform/4.11/service_mesh/v2x/ossm-reference-smcp.html#ossm-cr-example_ossm-reference