Added Javadoc and instructions for contribution

src/main/java/org/cametendo/Dd.java

@@ -3,7 +3,26 @@ import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 
+/**
+ * Executes the dd command for disk flashing operations.
+ * 
+ * <p>This class handles the actual execution of the dd command with the configured
+ * parameters (input file, output device, block size, and output flags). It provides
+ * real-time output streaming and calls the OSDetector for completion messages.</p>
+ * 
+ * @author Cametendo
+ * @version 1.0
+ */
 public class Dd {
+    
+    /**
+     * Executes the dd command with the configured parameters.
+     * 
+     * <p>Runs the dd command using sudo with the specified image file, target device,
+     * block size, and output flags. Streams the command output in real-time to show
+     * progress. Upon completion, calls {@link OSDetector#wishWell(String)} to display
+     * a completion message based on the image file name.</p>
+     */
     public static void dd() {
                 try {
             ProcessBuilder pb = new ProcessBuilder("sudo", "dd", "if=" + FilePathAdd.ImagePath, "of=" + StorageDeviceLister.fullPath, "bs=" + BlockSize.blockSizeString, "status=progress", "oflag=" + OflagHandler.oflagHandleString);