add siunitx for Si units

wbh.tex

@@ -41,7 +41,8 @@ $endif$
 % This two Packages are needet for Pandoc Table support. Issue is opened: https://github.com/jgm/pandoc/issues/1023
 \usepackage{longtable}
 \usepackage{booktabs}
-
+% For using SI units https://www.ctan.org/pkg/siunitx
+\usepackage{siunitx}
 
 % blockquote
 \definecolor{blockquote-border}{RGB}{221,221,221}