Add snippet for two columns to latex snippets

snippets/tex.snippets

@@ -247,3 +247,12 @@ snippet example
 	\begin{exampleblock}{${1:title}}
 	${2}
 	\end{exampleblock}
+snippet col2
+	\begin{columns}
+		\begin{column}{0.5\textwidth}
+			${1}
+		\end{column}
+		\begin{column}{0.5\textwidth}
+			${2}
+		\end{column}
+	\end{columns}