Added content to the README file

Author: Brent Wilkins

Firmware/Examples/Bridge_Example/README.md

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+These two example sketches are nearly identical. The key difference is the
+authentication tokens will be swapped in the two. This example code for the
+SparkFun Blynk Board demonstrates the functionality of the Bridge widget.
+Using two of these boards to send signals from one board to the other, or from
+one connected mobile device to either Blynk Board or another mobile device if
+available. Simple wireless buttons and a more complex chat app are part of this
+demo.
+
+For more information please see the [tutorial](https://learn.sparkfun.com/tutorials/blynk-board-bridge-widget-demo/) on the SparkFun website.