add graphicx package

doc/mainDocument/mainDocument.tex

@@ -9,6 +9,7 @@
 \usepackage[hidelinks]{hyperref}
 \usepackage{tabularx} % used for better table formatting see: https://en.wikibooks.org/wiki/LaTeX/Tables#The_tabularx_package
 \usepackage[table]{xcolor}
+\usepackage{graphicx}	% Bilder, Fotos
 \usepackage{subfiles}	% split doc into multiple .tex subfiles
 \graphicspath{ {./img/} }
 \usepackage{float} % used to allow the [H] option for tables, etc.