add copyright

Author: toddkarin

README.md

@@ -40,4 +40,21 @@ In order to set up this application in Heroku, we followed the [Heroku install i
 ```
 functools32==3.2.3.post2
 futures==3.2.0
-```
+```
+
+# Copyright
+
+String Length Calculator Copyright (c) 2020, The Regents of the University of
+California, through Lawrence Berkeley National Laboratory (subject to receipt of 
+any required approvals from the U.S. Dept. of Energy).  All rights reserved.
+
+If you have questions about your rights to use or distribute this software,
+please contact Berkeley Lab's Intellectual Property Office at
+[email protected].
+
+NOTICE.  This Software was developed under funding from the U.S. Department
+of Energy and the U.S. Government consequently retains certain rights.  As
+such, the U.S. Government has been granted for itself and others acting on
+its behalf a paid-up, nonexclusive, irrevocable, worldwide license in the
+Software to reproduce, distribute copies to the public, prepare derivative 
+works, and perform publicly and display publicly, and to permit others to do so.