Added 'Creating Knative Services' section

[abrennan89]

Proposed Changes

• Added Creating Knative Services section

@RichieEscarez this should replace some of the work previously done in #1972 - I think there was some confusion about that PR because the scope wasn't necessarily supposed to be creating a service so much as collecting all the information about services and organizing it.

This new section should be inline with the plans in the nav doc though, I will address the other sections related to services (e.g. cluster local) in subsequent PRs so that I can keep the scope smaller and avoid confusion.

[samodell]

Thanks for working on this, Ashleigh! Some feedback for you

[samodell]

This section doesn't show how to make an update to a Service, but it would be great to demo that.

[nak3]

There are various example, if we want to demo how to update Label, we can write it like this:

---

For example, you can add a label to a Knative Service in the same way as Kubernetes resources.

$ kubectl label ksvc hello-example example=demo-label

Then, the label example=demo-label is copied to Route and Configuration automatically.

$ kubectl get ksvc,rt,config --show-labels
NAME                                        URL                                               LATESTCREATED           LATESTREADY             READY   REASON   LABELS
service.serving.knative.dev/hello-example   http://hello-example.default.example.com   hello-example-hlplq-1   hello-example-hlplq-1   True             example=demo-label

NAME                                      URL                                               READY   REASON   LABELS
route.serving.knative.dev/hello-example   http://hello-example.default.example.com   True             example=demo-label,serving.knative.dev/service=hello-example

NAME                                              LATESTCREATED           LATESTREADY             READY   REASON   LABELS
configuration.serving.knative.dev/hello-example   hello-example-hlplq-1   hello-example-hlplq-1   True             example=demo-label,serving.knative.dev/route=hello-example,serving.knative.dev/service=hello-example

[abrennan89]

Hi @samodell 🙂
I've implemented all of the feedback now except for the request to doc 'updating a Service'.
@markusthoemmes can you provide details if we wanted to add this?
I think updating can be covered in a separate PR though since this once is just for creating Services.
Wdyt?

[samodell]

/lgtm
/approve

Thanks, Ashleigh!

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