Update test README.md

[MIBc]

Add flags and their explaination.

[knative-prow-robot]

Hi @MIBc. Thanks for your PR.

I'm waiting for a knative member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[coryrc]

/ok-to-test

[coryrc]

Thanks, looks great!

[coryrc]

Unfortunately it will take a week or so for the holidays to be over and someone to approve it for merging. Sorry I can't!

/assign @adrcunha

[MIBc]

That's ok. Thanks

[adrcunha]

/approve
/lgtm

[knative-prow-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: adrcunha, coryrc, MIBc

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