chg: [best practices] reference to Guidelines to setting up an

information sharing community such as an ISAC or ISAO added.

ref: https://www.x-isac.org/publication.html

a.4-best-practices/content.tex

@@ -9,7 +9,7 @@
 	\frametitle{Plan for this session}
 	\begin{itemize}
 		\item Explanation of the CSIRT use case for information sharing and what CIRCL does
-		\item Building an information sharing community and best practices
+        \item Building an information sharing community and best practices\footnote{We published the complete guidelines in \url{https://www.x-isac.org/assets/images/guidelines_to_set-up_an_ISAC.pdf}}
 	\end{itemize}
 \end{frame}