Added helm repo instructions + first build#499

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KlavsKlavsen wants to merge 3 commits intolmenezes:mainfrom Obmondo:upstream-version

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Commits on Mar 16, 2021

added Helm chart from https://github.com/helm/charts/tree/master/stable/cerebro - relevant copyrights remain theirs as listed in source.
KlavsKlavsen
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add helm repo files and docs on it.
KlavsKlavsen
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Commits on Mar 18, 2021

updated to match upstream paths
KlavsKlavsen
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