Update README.md

Author: Red Team

README.md

@@ -58,6 +58,7 @@ There will be two ways to set this puppy up. I prefer the second way, but that c
 ## Materials
 - [Arduino UNO](https://www.amazon.com/gp/product/B01N4LP86I/ref=oh_aui_detailpage_o06_s00?ie=UTF8&psc=1)
 - [WS2812b Individually Addressable LEDs](https://www.amazon.com/gp/product/B01CDTEJBG/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1)
+- [Sparkfun Spectrum Shield](https://www.amazon.com/gp/product/B00X0K30I6/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1) (second method)
 
 ## Standalone Arduino UNO Setup
 ### Code