add library properties and revision files

library.properties

+name=AudioTuner
+version=2.0
+author=Colin Duffy
+maintainer=Colin Duffy
+sentence=Yin algorithm
+paragraph=Yin algorithm to detect the fundmental frequency.
+category=Signal Input/Output
+url=http://github.com/duff2013/AudioTuner
+architectures=*
+

revision.md

+><b>Updated (7/10/15 v2.0)</b><br>
+* First commit