Added arduino libs

libraries/PID/library.properties

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+name=PID
+version=1.2.0
+author=Brett Beauregard 
+maintainer=Brett Beauregard
+sentence=PID controller
+paragraph=A PID controller seeks to keep some input variable close to a desired setpoint by adjusting an output. The way in which it does this can be 'tuned' by adjusting three parameters (P,I,D).
+category=Signal Input/Output
+url=http://playground.arduino.cc/Code/PIDLibrary
+architectures=*