add copyright information

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+saturn-tools as a whole is licensed under the following standard MIT license:
+
+----------------------------------------------------------------------
+Copyright © 2015 Bobby Bingham
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+----------------------------------------------------------------------
+
+Portions of this software are derived from third-party works licensed
+under terms compatible with the above MIT license:
+
+The install script (tools/install.sh) is Copyright © 2005-2014 Rich
+Felker, et al, and is licensed under the above MIT license. It was
+taken from musl libc.
+
+All other files which have no copyright comments are original works
+produced specifically for use as part of this software, written either
+by Bobby Bingham, the main author of the software, or by one or more
+contibutors. Details on authorship of individual files can be found in
+the git version control history of the project. The omission of
+copyright and license comments in each file is in the interest of
+source tree size.
+
+The saturn-mkboot will compile but will not produce bootable disk
+images correctly without access to a "security code" binary which is
+bopyrighted by Sega. This file is not distributed as part of this
+package, but the README file has instructions for extracting one if
+you have access to a legitimate Sega Saturn game disk.