Create README.md

A note and links to the data sheets for components used in the video.

README.md

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+proto_shield
+============
+
+Here you will find the code and data sheet links for the custom proto shield project.
+
+Data sheet links are as follows:
+**NOTE: these are specific to the components used in the video.  When choosing your parts you may have
+different types.  Make sure datasheets match your components.
+
+digital potentiometer (pot) - http://pdfserv.maximintegrated.com/en/ds/DS1868.pdf
+10 bit DAC - http://www.analog.com/static/imported-files/data_sheets/AD7390_7391.pdf
+12 bit counter - http://www.ti.com/lit/ds/symlink/sn54hc4040.pdf
+analog temperature sensor - http://www.analog.com/static/imported-files/data_sheets/AD592.pdf
+
+Other parts:
+
+Proto shield similar to - http://www.makershed.com/MakerShield_p/msms01.htm
+discrete components such as resistors and capacitors as called out in schematic.