Added COPYRIGHT and LICENSE.MIT files

COPYRIGHT

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+All copyright notices related to the VPaint project are centralized
+in this file (the "COPYRIGHT file"). We use Git, a version control
+system, to track accurate authorship information. Please consult
+https://github.com/dalboris/vpaint to retrieve this information.
+
+The group of all individuals and organizations who have contributed
+to the source code of VPaint is referred to as "The VPaint Developers".
+By inserting your copyright notice under this category, you aknowledge
+that you have read the terms and conditions in the LICENSE.MIT file, and
+accept to license your source code contributions under these terms.
+
+The VPaint Developers:
+----------------------
+Copyright (C) 2012-2016 Boris Dalstein <dalboris@gmail.com>

LICENSE.MIT

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+Copyright (C) 2012-2016 The VPaint Developers.
+See the COPYRIGHT file at the top-level directory of this distribution
+and at https://github.com/dalboris/vpaint/blob/master/COPYRIGHT
+
+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.