add testing info to readme

Author: toddtreece

README.md

@@ -1,19 +1,10 @@
 # Adafruit IO Arduino Library [![Build Status](https://travis-ci.org/adafruit/Adafruit_IO_Arduino.svg?branch=master)](https://travis-ci.org/adafruit/Adafruit_IO_Arduino)
 
-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.
-
-An alternative is the [Adafruit MQTT library](https://github.com/adafruit/Adafruit_MQTT_Library) 
-which uses the MQTT protocol to talk to Adafruit IO.  This is good for devices
-that are always on and need to keep a connection alive to to be quickly notified
-of changes.
-
-Currently this library supports the send API to send a value to a feed and the
-receive/last API to get the latest value from a feed.
-
-The supported platforms are the Adafruit CC3000, FONA, and ESP8266 Arduino.
+Example            | ESP8266      | M0 WINC1500  | WICED       | FONA 32u4   | Ethernet
+------------------ | :----------: | :----------: | :---------: | :---------: | ---------
+01_publish         |      ✓       |      ?       |      ?      |      ?      |      ?
+02_subscribe       |      ✓       |      ?       |      ?      |      ?      |      ?
+03_pubsub          |      ✓       |      ?       |      ?      |      ?      |      ?
+04_multiple_feeds  |      ✓       |      ?       |      ?      |      ?      |      ?
+05_location        |      ✓       |      ?       |      ?      |      ?      |      ?
+06_type_conversion |      ✓       |      ?       |      ?      |      ?      |      ?