chg:[attack] add an intro to MISP galaxy

x.17-eu-attack-community/content.tex

@@ -5,6 +5,20 @@
 \titlepage
 \end{frame}
 
+
+\begin{frame}
+  \frametitle{What is a MISP Galaxy?}
+  \begin{itemize}
+	  \item MISP Galaxy is a feature in MISP and a MISP standard\footnote{\url{https://www.misp-standard.org/}} format to create {\bf contextualization libraries}.
+    \begin{itemize}
+      \item There are two main types: \textbf{combined list} or \textbf{matrix-like list}.
+    \end{itemize}
+    \item The first historical matrix-like galaxy was MITRE ATT\&CK\footnote{Presented at the first EU ATT\&CK community meeting in Luxembourg}.
+    \item Galaxies contain intelligence that can be \textbf{structured} in a matrix-like format. Relationships between models can be created, and implementation such as in MISP allows for the \textbf{forking and sharing of information}. This is typically attached to intelligence in threat intelligence platforms to add context.
+  \end{itemize}
+\end{frame}
+
+
 \begin{frame}
 	\frametitle{MISP galaxies over time}
 	\begin{center}