docs : add NOTICE file for legal disclaimer

NOTICE

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+This work was developed at the University of Illinois and at
+Charmworks, Inc. with funding from various funding agencies, including
+the Department of Energy, National Science Foundation, National
+Institutes of Health.
+
+
+Neither the University of Illinois, nor Charmworks, Inc., nor any of
+their employees makes any warranty, expressed or implied, or assumes
+any legal liability or responsibility for the accuracy, completeness,
+or usefulness of any information, apparatus, product, or process
+disclosed, or represents that its use would not infringe privately
+owned rights.