Copy license file to the toplevel directory

LICENSE.md

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+Copyright (c) 1993-2024 Paul Mattes.  
+Copyright (c) 2004-2005 Don Russell.  
+Copyright (c) 2004 Dick Altenbern.  
+Copyright (c) 1990 Jeff Sparkes.  
+Copyright (c) 1989 Georgia Tech Research Corporation (GTRC), Atlanta, GA
+ 30332.  
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+- Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+- 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.
+- Neither the names of Paul Mattes, Don Russell, Dick Altenbern, Jeff
+      Sparkes, GTRC nor the names of their contributors may be used to endorse
+      or promote products derived from this software without specific prior
+      written permission.
+
+THIS SOFTWARE IS PROVIDED BY PAUL MATTES, DON RUSSELL, JEFF SPARKES, DICK
+ALTENBERN AND GTRC "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL PAUL MATTES, DON RUSSELL,
+DICK ALTENBERN, JEFF SPARKES OR GTRC BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.