Added constant time array comparison example

Author: TwoTenPvP

README.md

@@ -56,4 +56,13 @@ using (RSACryptoServiceProvider clientRSA = new RSACryptoServiceProvider())
     byte[] key1 = serverDiffie.GetVerifiedSharedPart(clientPublic);
     byte[] key2 = clientDiffie.GetVerifiedSharedPart(serverPublic);
 }
+```
+### Timing Side Channel Attack Prevention
+```csharp
+byte[] array1 = new byte[120];
+byte[] array2 = new byte[120];
+array[50] = 67;
+
+// This comparison will take constant time, no matter where the diff is (if any).
+bool equal = ComparisonUtils.ConstTimeArrayEqual(array1, array2);
 ```