Added a little help to the readme

Author: bradjc

README.md

@@ -1,4 +1,28 @@
-watts-up
-========
+Watts Up? Python Interface
+==========================
 
-Code to interface with the Watts up? .net
+Code to interface with the Watts up? .net. Works over the USB cable. Allows you
+to view samples in a terminal, save to a logfile, or POST them using the
+network connection.
+
+
+Usage
+-----
+
+### Linux
+
+    python wattsup.py -p /dev/ttyUSBX -i
+    python wattsup.py --help
+
+### Mac OS X
+
+Install the http://www.ftdichip.com/Drivers/VCP.htm drivers. Restart.
+
+    python wattsup.py -p /dev/tty.usbserial-X -i
+
+
+Server
+------
+
+A simple python script that receives the HTTP request from Watts Up .net
+and prints out the values in JSON format.