[New] How to Create a HarperDB Cluster (#6510)

* Initial draft of how to create a HarperDB cluster guide

* How to Create a HarperDB Cluster - Tech edits

* Updated front matter

* Copy edit

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Co-authored-by: Sachin-Suresh <Sachin301190@gmail.com>
Co-authored-by: Matthew Wildman <matt@wildman.online>