Addding readme and license file

LICENSE.md

+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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README.md

+## ITACTC
+
+ITACTC is a C++ library for crosstalk-cancellation filter design. It also includes real-time filtering components that apply CTC.
+
+### License
+
+See [LICENSE](LICENSE.md) file.
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