How to install tikz-cd, I am using texshop. I need the following
\documentclass{article}
\usepackage{tikz-cd}
\usetikzlibrary{arrows}
\tikzset{
commutative diagrams/.cd,
arrow style=tikz,
diagrams={>=space}}
\begin{document}
\begin{tikzcd}
& A \arrow{d} & \\
& B \arrow{dl}\arrow{dr} & \\
C \arrow{dr} & & D \arrow{dl} \\
& F & \\
\end{tikzcd}
\end{document}
Or alternatively, could we write in a different way?