Adds license

LICENSE

@@ -0,0 +1,22 @@
+Copyright © 2018, Lawrence Livermore National Security, LLC All Rights Reserved
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice, this 
+list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice, 
+this list of conditions and the following disclaimer in the documentation
+and/or other materials provided with the distribution.
+3. Neither the names of UChicago Argonne, LLC or the Department of Energy nor 
+the names of its contributors may be used to endorse or promote products
+derived from this software without specific prior written permission.
+
+THE SOFTWARE IS SUPPLIED "AS IS" WITHOUT WARRANTY OF ANY KIND.
+
+NEITHER THE UNITED STATES GOVERNMENT, NOR THE UNITED STATES DEPARTMENT OF
+ENERGY, NOR LLNS, LLC, NOR ANY OF THEIR EMPLOYEES, MAKES ANY
+WARRANTY, EXPRESS OR IMPLIED, OR ASSUMES ANY LEGAL LIABILITY OR RESPONSIBILITY
+FOR THE ACCURACY, COMPLETENESS, OR USEFULNESS OF ANY INFORMATION, DATA,
+APPARATUS, PRODUCT, OR PROCESS DISCLOSED, OR REPRESENTS THAT ITS USE WOULD
+NOT INFRINGE PRIVATELY OWNED RIGHTS.