add: readme and copyright

README.md

+## ITADataSources
+
+ITADataSources is a C++ library for component-oriented audio streaming providing basic modules to manipulate samples in a block-based audio processing.
+
+### 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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