Add a separate license file.

LICENSE.rst

@@ -0,0 +1,26 @@
+Individual licensing and copyright statements are present in
+many files.
+
+Copyright (c) 1994, 1995, 1996, 1997 Carnegie Mellon University
+Copyright (c) 1998-2004 Gwydion Dylan Maintainers
+Copyright (c) 2015 Mindy Contributors
+All rights reserved.
+
+Use and copying of this software and preparation of derivative
+works based on this software are permitted, including commercial
+use, provided that the following conditions are observed:
+
+1. This copyright notice must be retained in full on any copies
+   and on appropriate parts of any derivative works.
+2. Documentation (paper or online) accompanying any system that
+   incorporates this software, or any part of it, must acknowledge
+   the contribution of the Gwydion Project at Carnegie Mellon
+   University, and the Gwydion Dylan Maintainers.
+
+This software is made available "as is".  Neither the authors nor
+Carnegie Mellon University make any warranty about the software,
+its performance, or its conformity to any specification.
+
+Bug reports should be sent to <[email protected]>; questions,
+comments and suggestions are welcome at <[email protected]>.
+Also, see http://www.gwydiondylan.org/ for updates and documentation.