Added Javadoc and instructions for contribution

src/main/java/org/cametendo/Greeting.java

@@ -2,7 +2,25 @@ package org.cametendo;
 
 import java.util.Scanner;
 
+/**
+ * Handles the initial greeting and user confirmation for the cflash application.
+ * 
+ * <p>This class provides a welcome message and prompts the user to confirm
+ * whether they want to proceed with flashing an image to a storage device.</p>
+ * 
+ * @author Cametendo
+ * @version 1.0
+ */
 public class Greeting {
+    
+    /**
+     * Displays a welcome message and prompts for user confirmation.
+     * 
+     * <p>Shows the cflash welcome message and asks the user if they want to
+     * flash an image. If the user declines, exits the application.</p>
+     * 
+     * @param UserInput Scanner object for reading user confirmation
+     */
     public static void greeting(Scanner UserInput) {
         System.out.println("Welcome to cflash!");
         System.out.println("Would you like to flash an image (Y/n)");