Guide on using Open Liberty Operator

[yeekangc]

Consider a guide on how to use Open Liberty Operator: https://operatorhub.io/operator/open-liberty

[gkwan-ibm]

• prototyping still in progress

[bschrammIBM]

We need to schedule this to match releases.

[yeekangc]

We will integrate usage of Operator(s) particularly the Open Liberty Operator into existing guides (e.g. Deploy to OpenShift guide). That's where it is most relevant to users/developers.

Actual documentation for Open Liberty Operator should be its repo and should be covered by Open Liberty documentation too.

FYI, @arthurdm @leochr @lauracowen.

[yeekangc]

See #411 where we will update the existing OpenShift guide.