add license info

LICENSE.md

+> Copyright (C) 2013-2015 Dynare Team
+>
+> License: GPL-3+
+>  Dynare Reporting 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 3 of the License, or
+>  (at your option) any later version.
+>
+>  This code 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.
+
+>  A copy of the GNU General Public License is available here
+>  <http://www.gnu.org/licenses/>.

license.txt

+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: Dynare
+Upstream-Contact: Dynare Team, whose members in 2015 are:
+                  Stéphane Adjemian <stephane.adjemian@univ-lemans.fr>
+                  Houtan Bastani <houtan@dynare.org>
+                  Michel Juillard <michel.juillard@mjui.fr>
+                  Frédéric Karamé <frederic.karame@univ-lemans.fr>
+                  Junior Maih <junior.maih@gmail.com>
+                  Ferhat Mihoubi <fmihoubi@univ-evry.fr>
+                  George Perendia <george@perendia.orangehome.co.uk>
+                  Johannes Pfeifer <jpfeifer@gmx.de>
+                  Marco Ratto <marco.ratto@jrc.ec.europa.eu>
+                  Sébastien Villemot <sebastien@dynare.org>
+Source: http://www.dynare.org
+
+Files: *
+Copyright: 1996-2015 Dynare Team
+License: GPL-3+
+
+License: GPL-3+
+ Dynare Reporting 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 3 of the License, or
+ (at your option) any later version.
+ .
+ Dynare Reporting 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 Dynare.  If not, see <http://www.gnu.org/licenses/>.