added liscence and updated readme.md to point to it

README.md

-This repository contains the source code for the Operations System of the 4MOST project.
+## 4MOST-OpSys - code for the Operations System of the 4MOST project
+
+## Scope:
+
+This repository contains the source code for the Operations System (OpSys) of the 4MOST project.
+
+## Legal:
+
+Copyright (2015-2016) 4MOST OpSys Team, MPE, Garching, Germany 
+
+> 4MOST-OpSys 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/>.
+
+## Content:
+The 4MOST-OpSys is a collection of software tools (most) implemented in C.
+Build scripts are supplied that allow compilation of the souerce code on UNIX-like systems.
+
+## Contact:
+
+Please send comments, complaints and suggestions to 4most 'at' mpe.mpg.de    
+