add an example to library that uses deployments kind

[sozercan]

Describe the solution you'd like Seen a few questions in Slack that users are trying to use Deployment kind (for allowed replica count for example) but not using apps api group, we should add an example to library for this usecase

[nilekhc]

@sozercan I have written policy that looks for nodeSelector of deployment (#594) . Let me know if this looks correct. If so I'll open a PR.

[stale[bot]]

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