Include book as bib entry

[aminmkhan]

Add book as highlighted here and here.

\DeclareFieldFormat[book]{title}{#1\par}

\DeclareBibliographyDriver{book}{%
  \fontsize{9pt}{1em}\bodyfont%
  \printfield{title}%
  \newblock%
  \printnames{author}%
  \par%
  \newblock%
  {%
    \fontsize{8pt}{1em}\bodyfontlight\color{graytext}%
    \printlist{publisher}%
    \setunit{\addcomma\space}%
    \printfield{note}%
    \setunit{\addcomma\space}%
    \printfield{year}%
    \newunit%
  }
  \par\vspace{0.3\baselineskip}
}