Add datadog plugin to index

[L3n41c]

Add the datadog plugin.

The datadog kubectl plugin provides useful utilities to operate datadog-agent components via the Datadog Operator and the DatadogAgent CRD.

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[ahmetb]

@L3n41c To clarify, are you submitting this at an official capacity, correct? If the binary explicitly prepared as a kubectl plugin and would your docs installation Krew as an install method as well?

[L3n41c]

Hello @ahmetb,

Indeed, I’m pushing this PR as a Datadog employee.
Our plugin already has the instructions for being installed as a krew plugin: https://github.com/DataDog/datadog-operator/blob/master/docs/kubectl-plugin.md
I’ve prepared a PR to update the instructions once the datadog plugin will referenced inside the krew index: DataDog/datadog-operator#126.

[ahmetb]

/lgtm
/approve
Welcome to Krew!

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ahmetb, L3n41c

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