Merge pull request #85 from SaftIng/feature/updateLicense

Update License text in README, added CONTRIBUTORS file

CONTRIBUTORS

@@ -0,0 +1,5 @@
+Konrad Abicht <http://aksw.org/KonradAbicht>
+Natanael Arndt <http://aksw.org/NatanaelArndt>
+Viktor Befort <http://aksw.org/StudentWorker/ViktorBefort>
+Oliver Skawronek <http://aksw.org/StudentWorker/OliverSkawronek>
+Philipp Frischmuth <http://aksw.org/PhilippFrischmuth>

README.md

@@ -11,7 +11,14 @@ For documentation please see http://safting.github.io/doc/.
 
 ## License
 
-This project is licensed under the terms of the GNU General Public License (GPL), please see [LICENSE](LICENSE) for further information.
+Copyright (C) 2017 by Konrad Abicht, Natanael Arndt and the individual [contributors](CONTRIBUTORS)
+
+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 3 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, see <http://www.gnu.org/licenses>.
+Please see [LICENSE](LICENSE) for further information.
 
 ## Current status