Add IPP-LICENSE and README note about PLII encoding

IPP-LICENSE

@@ -0,0 +1,78 @@
+Intel Simplified Software License
+
+Intel Simplified Software License for Intel® Math Kernel Library (Intel® MKL),
+Intel® Integrated Performance Primitives (Intel® IPP) Library, Intel® Machine
+Learning Scaling Library (Intel® MLSL), Intel® Data Analytics Acceleration
+Library (Intel® DAAL), Intel® Threading Building Blocks (Intel® TBB), Intel®
+Distribution for Python* (version June 2017)
+
+Copyright © 2017 Intel Corporation.
+
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+
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README.md

@@ -38,3 +38,12 @@ refresh-rate.
 * **[Windows]** WASAPI
 * **[OS X]** Audio Queue Services
 * **[Linux]** ALSA
+
+#### Pro Logic II Encoding Support
+
+The Boo audio engine supports real-time Pro Logic II surround matrixing for 5.1 client mixes.
+Call `IAudioVoiceEngine::enableLtRt(true);` to enable this functionality.
+
+**Note:** Before building Boo, the [Intel Integrated Performance Primitives](https://software.intel.com/en-us/intel-ipp)
+must be installed for full surround-sound encoding capabilities. Without this library, only the left, right, and center
+channels will be encoded. The surround channels are phase-shifted 90-degrees using the Hilbert functions in the library.

lib/audiodev/AudioVoiceEngine.cpp

@@ -1,5 +1,4 @@
 #include "AudioVoiceEngine.hpp"
-#include "LtRtProcessing.hpp"
 
 namespace boo
 {