Add info on where to find new versions

texts/smlm-lab-course/smlm-lab-manual.tex

@@ -17,6 +17,18 @@
 
 \tableofcontents
 
+\chapter{About this Manual}
+
+This manual accompanies a laboratory course on super resolution microscopy at the École Polytechnique Fédérale de Lausanne (EPFL). The course is part of the Institute of Physics Travaux Pratiques de Physique III, which occurs during the third year of study.
+
+\section{Where to Find New Versions}
+
+You can find the latest versions of this manual here: \url{https://github.com/kmdouglass/teaching/releases}
+
+\section{Reporting Errors}
+
+If you spot any errors, please open an issue on GitHub here: \url{https://github.com/kmdouglass/teaching/issues}
+
 \chapter{Introduction}
 
 \section{Super-Resolution Fluorescence Microscopy}