adding publisher interface, class, & bootstrap data#259

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AndrewBergstrom wants to merge 2 commits intospringframeworkguru:masterfrom

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Commits on Feb 26, 2023

Setting up Author and Book class, creating new entities, getters, setters, equals, hascodes, and using toString()
AndrewBergstrom
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author and book class set up'
AndrewBergstrom
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