Fix: correct README according to simple example

README.md

@@ -31,13 +31,25 @@ We have two variables
     \item n: \Var{n}
 \end{itemize}
 
-%# We can use blocks
+\section{Variables}
+\subsection{subject}
 \begin{itemize}
-%- for i in n
+%- for k,v in subject.items()
-    \item \Var{a}
+    \item
+\begin{verbatim}
+    \Var{k}: \Var{v}
+\end{verbatim}
+%- endfor
+\end{itemize}
+\subsection{options}
+\begin{itemize}
+%- for k,v in options.items()
+    \item
+\begin{verbatim}
+    \Var{k}: \Var{v}
+\end{verbatim}
 %- endfor
 \end{itemize}
-
 
 \end{document}