add initial code

src/main.cpp

@@ -0,0 +1,31 @@
+/*************************************************************************
+ *
+ *  This file is part of the ACT library
+ *
+ *  Copyright (c) 2020 Rajit Manohar
+ *
+ *  This program is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU General Public License
+ *  as published by the Free Software Foundation; either version 2
+ *  of the License, or (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ *  Boston, MA  02110-1301, USA.
+ *
+ **************************************************************************
+ */
+
+#include <iostream>
+
+int main (int argc, char **argv) {
+
+    std::cout << "Hello world!" << std::endl;
+
+}