Create a WS2812b sample using SPI

Samples/SPIWS2812b/CS/.gitignore

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+## Ignore Visual Studio temporary files, build results, and
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Samples/SPIWS2812b/CS/App.xaml

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+<Application
+    x:Class="IoT.Windows10.ws2812b.App"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:local="using:IoT.Windows10.ws2812b">
+
+</Application>