Add licence and readme

LICENSE.txt

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+All source files are distributed under the BSD 3-Clause License unless
+otherwise noted in the source file.
+
+Software License Agreement (BSD 3-Clause License)
+---------------------------------------------------------------------------
+
+Copyright (c) 2015, Nils Moehrle
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+1. Redistributions of source code must retain the above copyright notice,
+   this list of conditions and the following disclaimer.
+2. Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+3. Neither the name of the copyright holder nor the names of its contributors
+   may be used to endorse or promote products derived from this software
+   without specific prior written permission.
+
+This software is provided by the copyright holders and contributors "as is"
+and any express or implied warranties, including, but not limited to, the
+implied warranties of merchantability and fitness for a particular purpose
+are disclaimed. In no event shall the copyright holder or contributors be
+liable for any direct, indirect, incidental, special, exemplary, or
+consequential damages (including, but not limited to, procurement of
+substitute goods or services; loss of use, data, or profits; or business
+interruption) however caused and on any theory of liability, whether in
+contract, strict liability, or tort (including negligence or otherwise)
+arising in any way out of the use of this software, even if advised of the
+possibility of such damage.

README.md

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+libacc
+-------------------------------------------------------------------------------
+This project offers a header only acceleration structure library including
+implementations for a BVH- and KD-Tree. Applications may include ray
+intersection tests or nearest neighbor searches.
+
+Requirements
+-------------------------------------------------------------------------------
+Compiler with C++11 support - parallel tree construction is implemented with
+`std::thread` and `std::atomic`
+
+License
+-------------------------------------------------------------------------------
+The software is licensed under the BSD 3-Clause license,
+for more details see the LICENSE.txt file.