Add the support files.

contrib/mingw/AUTHORS

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+Chris Johns <chrisj@rtems.org>

contrib/mingw/ChangeLog

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+2006-07-21  Chris Johns  <chrisj@rtems.org>
+
+	* build-exes.sh, rtems-tools.nsi, rtems.ini, rtems_logo.bmp:
+	Add NSIS installer support for MinGW.
+

contrib/mingw/README

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+
+    Copyright (C) 2006	Chris Johns, Sydney, Australia <chrisj@rtems.org>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+