add serial example

[challenge-bot] / serial / README

diff --git a/serial/README b/serial/README
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+(how to use this
+ (connect your robot to your computer via usb cable)
+ (open arduino ide)
+ (in arduino ide, open serial.ino)
+ (hit the upload button)
+ (hit control+shift+m,
+  or go to the menu item tools, and down to serial monitor)
+ (in the bottom right, select "9600 baud")
+ (hit the reset button on the arduino)
+ (you should see "hello computer!" each time you hit the reset button)
+ (yaaay!))
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