Adding disclaimer

DISCLAIMER.txt

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+This material was prepared as an account of work sponsored by an agency of the
+United States Government.  Neither the United States Government nor the United 
+States Department of Energy, nor Battelle, nor any of their employees, nor any
+jurisdiction or organization that has cooperated in the development of these
+materials, makes any warranty, express or implied, or assumes any legal
+liability or responsibility for the accuracy, completeness, or usefulness or
+any information, apparatus, product, software, or process disclosed, or
+represents that its use would not infringe privately owned rights.
+
+Reference herein to any specific commercial product, process, or service by
+trade name, trademark, manufacturer, or otherwise does not necessarily
+constitute or imply its endorsement, recommendation, or favoring by the United
+States Government or any agency thereof, or Battelle Memorial Institute. The
+views and opinions of authors expressed herein do not necessarily state or
+reflect those of the United States Government or any agency thereof.
+
+                  PACIFIC NORTHWEST NATIONAL LABORATORY
+                              operated by
+                                BATTELLE
+                                for the
+                   UNITED STATES DEPARTMENT OF ENERGY
+                    under Contract DE-AC05-76RL01830