add AGOAC free download link

Author: jeremylt

rules/7-Resources/5-References.tex

@@ -50,6 +50,8 @@
 
     \item \emph{Official Downloads}: \href{https://bg.battletech.com/downloads}{https://bg.battletech.com/downloads}
 
+    \item \emph{A Game of Armored Combat}: \href{https://bg.battletech.com/forums/index.php?topic=62488.0}{https://bg.battletech.com/forums/index.php?topic=62488.0}
+
     \item \emph{Master Unit List}: \href{http://www.masterunitlist.info}{http://www.masterunitlist.info}
 
     \item \emph{MegaMek}: \href{https://megamek.org}{https://megamek.org}