Added an example of random passkey generator for CRC32 library

examples/PasskeyGenerator/PasskeyGenerator.ino

@@ -0,0 +1,55 @@
+/* PasskeyGenerator.ino
+
+   This sketch demonstrates how to use the Arduino_CRC32
+   library to calculate a CRC-32 checksum using a simple example of Random passkey suggester.
+
+  Written by Abhijeet Kadam
+*/
+
+/**************************************************************************************
+   INCLUDE
+ **************************************************************************************/
+
+#include <Arduino_CRC32.h>
+
+/**************************************************************************************
+   GLOBAL VARIABLES
+**************************************************************************************/
+
+Arduino_CRC32 crc32;
+
+char str1;
+
+char const ex_msg[] = "My_PassKey";         //your message here
+
+long randNumber;
+uint32_t crc_code;
+uint32_t final_passkey;
+/**************************************************************************************
+   SETUP/LOOP
+ **************************************************************************************/
+
+void setup()
+{
+  Serial.begin(9600);
+ crc_code = crc32.calc((uint8_t const *)ex_msg, strlen(ex_msg));        // CRC code generation
+Serial.println("Welcome to Random passkey suggester enter y to continue..");
+  Serial.println("NOTE: you can change your message in passkey_generator.ino");
+}
+void loop()
+{
+  if (Serial.available() > 0)
+  {
+    str1 = Serial.read();              // read the incoming:
+    if (str1 == 'y' || str1 == 'Y')
+    {
+      Serial.print("Your message : ");
+      Serial.println(ex_msg);
+      Serial.print("Your passkey suggestion : ");
+     final_passkey = crc_code * random(30, 4000) - random(5000); // passkey generation
+    Serial.println(final_passkey);
+      Serial.println("Enter y for new passkey suggestion");
+      Serial.println();
+   }
+  }
+}