Add SetForegroundColorOnBgColor.cs

SetForegroundColorOnBgColor.cs

@@ -0,0 +1,10 @@
+// Taken From: https://stackoverflow.com/questions/2241447/make-foregroundcolor-black-or-white-depending-on-background
+
+var foreColor = (PerceivedBrightness(backColor) > 130 ? Color.Black : Color.White);
+
+private int PerceivedBrightness(Color c) {
+    return (int)Math.Sqrt(
+    c.R * c.R * .299 +
+    c.G * c.G * .587 +
+    c.B * c.B * .114);
+}