add random graph dialog to documentation

doc/chapter/3ui.tex

@@ -77,7 +77,7 @@ These can also be used by clicking on one of the buttons displayed in figure~\re
         Alt + P & Activate automatic forwards execution. \\\hline
         Alt + R & Activate automatic backwards execution. \\\hline
         Alt + Pause & Pause automatic execution. \\\hline
-        Alt + G & Generate a random graph (opens a dialog window). \\\hline
+        Alt + G & Generate a random graph (opens dialog window~\ref{fig:random-graph-dialog}). \\\hline
         Alt + S & Save the current graph to a file (opens a dialog window). \\\hline
         Alt + L & Load a graph from a file (opens a dialog window). \\\hline
         Alt + D & Show a debug table (in a new window). \\\hline

doc/chapter/appendix.tex

@@ -1 +1,6 @@
-\TODO{add class diagrams}
+\begin{figure}[htp]
+    \centering
+    \includegraphics{img/random-graph-dialog}
+    \caption[Random graph dialog]{Dialog for generating random graphs.}
+    \label{fig:random-graph-dialog}
+\end{figure}