* add ability to restore cluster from snapshots

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* Update variables.tf
Co-authored-by: Vladimir <vladimir.fess@gmail.com>

* update readme

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Co-authored-by: Sung Kang <kang.sung@heb.com>
Co-authored-by: cloudpossebot <11232728+cloudpossebot@users.noreply.github.com>
Co-authored-by: Vladimir <vladimir.fess@gmail.com>