Add SpritzBenchmark

Author: abderraouf-adjal

README.md

@@ -243,6 +243,9 @@ Hash function test.
 * [SpritzMACTest](examples/SpritzMACTest/SpritzMACTest.ino):
 Message authentication code (MAC) function test.
 
+* [SpritzBenchmark](examples/SpritzBenchmark/SpritzBenchmark.ino):
+ArduinoSpritzCipher library benchmark (performance test).
+
 
 ## Installation Guide