Implement book search and filter features and add challenge documentation for JavaScript task(hard)

[Adil-Akothiat]

I Implmented searchBooks and filterBooks features, I created readme.md that describe the challenge(documentation), I add new property for the Library class called totalBooks that count the total number of books in the library, the property is incremented by 1 when we create a new book.

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[nikohoffren]

Merged

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