upd: readme text and copyright

README.md

-### ITABase C++ library
+## ITABase
+
+ITABAse is a C++ library with basic tools for virtual acoustics.
+
+### License
+
+Copyright 2015-2016 Institute of Technical Acoustics, RWTH Aachen University
+
+Any usage and distribution is prohibited, unless explicitly granted by the authors.
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