[GS] example model for #3910

Author: hqnghi88

ummisco.gama.network/models/Network/3 Advanced features/2 External GAMA controller.gaml

@@ -0,0 +1,17 @@
+model ExternalController
+
+global { 
+}
+
+ 
+
+
+experiment start
+{ 
+	init
+	{ 
+		write project_path;
+		write command("open "+project_path+"/scripts/controller.html");
+		do die;
+	}
+}