Update README.md

Author: tdicola

README.md

@@ -1,2 +1,7 @@
-# Adafruit_IO_Arduino
+# Adafruit IO Arduino Library
+
 Arduino library to access the Adafruit IO REST API on platforms like the FONA, CC3000, and ESP8266.
+This is a good library for simple send and receive access to Adafruit IO feeds.  Unlike MQTT the
+REST API does not require a connection to be kept alive so it's good for things to periodically
+need to connect and send/receive values.  For example a sensor device that sends sensor measurements
+to AIO and then enters deep power-saving sleep for a period is perfect to use with this library.