Adding README.MD to Libraries folder.

Author: jimblom

Libraries/README.MD

@@ -0,0 +1,28 @@
+SparkFun SX1509 I/O Expander Libraries
+=================================
+
+Libraries for use in different environments.
+
+
+Directory Contents
+-------------------
+* **/Arduino** - [Arduino IDE](http://www.arduino.cc/en/Main/Software) libraries
+
+
+License Information
+-------------------
+This product is open source!
+The code is beerware; if you see me (or any other SparkFun employee) at the local, and you've found our code helpful, please buy us a round!
+Please use, reuse, and modify these files as you see fit. Please maintain attribution to SparkFun Electronics and release anything derivative under the same license.
+
+Distributed as-is; no warranty is given.
+
+- Your friends at SparkFun.
+
+
+
+BUILD INSTRUCTIONS:
+
+$git subtree add -P <DIRECTORY NAME> --squash <git repo URL> <ref>
+
+$git subtree pull -P <DIRECTORY NAME> --squash <git repo URL> <ref>