Folder structure according Arduino IDE 1.5 Library specification

README.md

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+# Arduino PID Library
+### Version 1.2.1
+###### by Brett Beauregard <br3ttb@gmail.com> - [brettbeauregard.com](brettbeauregard.com)
+
+This Library is licensed under the MIT License
+
+- For an ultra-detailed explanation of why the code is the way it is, please visit: 
+   http://brettbeauregard.com/blog/2011/04/improving-the-beginners-pid-introduction/
+
+- For function documentation see:  http://playground.arduino.cc/Code/PIDLibrary