[#3] Remove "TODO" and add description with supported hardware.

Author: process1183

README.rst

@@ -9,7 +9,12 @@ Introduction
     :target: https://gitter.im/adafruit/circuitpython?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge
     :alt: Gitter
 
-TODO
+CircuitPython driver for the IS31FL3731 charlieplex IC.
+
+This driver supports the following hardware:
+
+* `Adafruit 16x9 Charlieplexed PWM LED Matrix Driver - IS31FL3731 <https://www.adafruit.com/product/2946>`_
+* `Adafruit 15x7 CharliePlex LED Matrix Display FeatherWings <https://www.adafruit.com/product/2965>`_
 
 Dependencies
 =============