Managed script guide

[ASheth1]

This is to create a document for how to contribute to managed-scripts.

--https://issues.redhat.com/browse/OSD-19235

Slack thread ---https://redhat-internal.slack.com/archives/C0326L38PEH/p1739160604433569

[openshift-ci]

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[openshift-ci]

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[MitaliBhalla]

All good to be closed in lieu of #214

[openshift-merge-robot]

PR needs rebase.

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