Add library.properties

library.properties

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+name=Audio
+version=1.02
+author=Paul Stoffregen
+maintainer=Paul Stoffregen
+sentence=Teensy Audio Library - Flexible, High Quality Audio Processing
+paragraph=A toolkit for building streaming audio projects, featuring Polyphonic Playback, Recording, Synthesis, Analysis, Effects, Filtering, Mixing, Multiple Simultaneous Inputs & Outputs, Flexible Internal Signal Routing, Automatic Streaming 16 bits, 44.1 kHz as the Arduino Sketch Runs.
+category=Signal Input/Output
+url=http://www.pjrc.com/teensy/td_libs_Audio.html
+architectures=*
+