simple code of conduct - for #586 (#593)

taken from helm. seems best practice to just link to the root one, and use lowercase naming (both helm and kubernetes/client-go does this)
kube-rs · Jul 19, 2021 · e668ca0 · e668ca0
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+# Community Code of Conduct
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+kube-rs follows the [CNCF Code of Conduct](https://github.com/cncf/foundation/blob/master/code-of-conduct.md).