Add OWNERS file

[a-roberts]

See #26 - tried to approve @jessm12's PR, did so with approve, details from Prow gives:

Details
Needs approval from an approver in each of these files:
OWNERS

We don't have such a file at https://github.com/tektoncd/dashboard/blob/master/OWNERS

Here's the one for tektoncd/pipeline though: https://github.com/tektoncd/pipeline/blob/master/OWNERS.

[a-roberts]

I'll add this

/assign

[vdemeester]

/close

[tekton-robot]

@vdemeester: Closing this issue.

In response to this:

/close

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