Update README.md

Add image

Author: brendonparker

README.md

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 This sample leverages the Arduino Uno to read badge scans from HID Prox ProxPoint Plus.
 For this code, I set the Green (Data) to pin 2, and the White (Clock) to pin 3.
 
+![Overhead Screenshot](image.jpg?raw=true, "Overhead Screenshot")
+
 This code works using the "Clock and Data" protocol as described here: http://emssa.net/source/images/new_pdf/appnote_2.pdf
 
 Please let me know if you find improvements that can be made to this sample.