Add a root element

• Our next step is to add the <BookCatalogue> root element.

• Ideally, we would like to output <BookCatalogue> prior to reading any input. Then, output </BookCatalogue> at the <<EOF>>.

• However, there is no regular expression for "prior to reading the input". So, we will output <BookCatalogue> when the scanner consumes the first Title token.

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