Added unicorn lib documentation and sample code

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diff --git a/unicorn/README.md b/unicorn/README.md
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+A go library for interacting with Raspberry Pi Unicorn HAT HD, with a cimilar API to the official library https://github.com/pimoroni/unicorn-hat-hd
+
+Includes a simulator when running on amd64 and 386 linux PCs.
+
+Sample usage:
+```
+package main
+
+import "github.com/MFAshby/unicornpaint/unicorn"
+
+func main() {
+	uni, _ := unicorn.GetUnicorn()
+	defer func() { uni.Off() }()
+	var x, r, y, g, b uint8
+	x = 10
+	y = 10
+	r = 255
+	g = 255
+	b = 255
+	uni.SetPixel(x, y, r, g, b)
+	uni.Show()
+	uni.MainLoop()
+}
+```
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