Add proper LPGL-3.0 license file

To support auto-detection at GitHub page

LICENSE

@@ -1,16 +1,165 @@
Copyright (C) 2011-2015 German Aerospace Center DLR
(Deutsches Zentrum fuer Luft- und Raumfahrt e.V.),
Institute of System Dynamics and Control

PySimulator is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

PySimulator 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with PySimulator. If not, see www.gnu.org/licenses.
                   GNU LESSER GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
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