add introduction environment

elegantbook-en.tex

@@ -277,6 +277,17 @@ The content of Preface.
 \end{lstlisting}
 
 \chapter{ElegantBook Writing Sample}
+
+\begin{introduction}
+\item Theorem Class Envrionments
+\item Cross Reference
+\item Math Environments
+\item List Environments
+\item Logo and Base 
+\item $a^2+b^2=c^2$
+\end{introduction}
+
+
 \lipsum[1]
 % source: https://www.maths.tcd.ie/~dwilkins/LaTeXPrimer/Theorems.html