Add credits list for KCS designs

[jberkus]

Describe the issue

Now that a bunch of the KCS designs are uploaded to this repo, we need a README giving credit for the creators of each design. Filing this issue so that we don't forget to do it.

/sig contributor-experience
/area events

cc @kas

[k8s-ci-robot]

@jberkus: The label(s) area/events cannot be applied, because the repository doesn't have them.

In response to this:

Describe the issue

Now that a bunch of the KCS designs are uploaded to this repo, we need a README giving credit for the creators of each design. Filing this issue so that we don't forget to do it.

/sig contributor-experience
/area events

cc @kas

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