Book crud52#53

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tas09009 wants to merge 6 commits intoFreeOpenUniversity:developfrom

tas09009:bookCRUD52

Commits on Jan 13, 2021

working: retrieve by category id
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Commits on Jan 15, 2021

created BookCategory files to filter books and categories
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Commits on Jan 17, 2021

bookcategory APIs working
tas09009
committed

Commits on Jan 19, 2021

Commits on Jan 20, 2021

all CRUD methods working
tas09009
committed