Added Javadoc and instructions for contribution

src/main/java/org/cametendo/FilePathAdd.java

@@ -9,10 +9,32 @@ import org.jline.reader.impl.completer.FileNameCompleter;
 import org.jline.terminal.Terminal;
 import org.jline.terminal.TerminalBuilder;
 
+/**
+ * Handles file path input and validation for disk image files.
+ * 
+ * <p>This class provides functionality to interactively prompt users for image file paths
+ * with tab completion support, validate that files exist and are regular files, and
+ * validate file paths from command-line arguments.</p>
+ * 
+ * @author Cametendo
+ * @version 1.0
+ */
 public class FilePathAdd {
 
+    /**
+     * Stores the validated path to the selected image file.
+     */
     public static String ImagePath = "";
 
+    /**
+     * Interactively prompts the user to select an image file path.
+     * 
+     * <p>Uses JLine for enhanced terminal interaction with tab completion support.
+     * Validates that the selected path points to an existing regular file.</p>
+     * 
+     * @return The validated path to the selected image file
+     * @throws IOException If there are I/O errors during terminal setup or file validation
+     */
     protected static String filePath() throws IOException {
         fileQuestion();
 
@@ -39,6 +61,15 @@ public class FilePathAdd {
         }
     }
 
+    /**
+     * Validates and returns the full path to an image file.
+     * 
+     * <p>Takes a file path, validates that it exists and is a regular file,
+     * and returns the real path. Used for command-line argument validation.</p>
+     * 
+     * @param ImagePath Path to the image file to validate
+     * @return Full validated path to the file, or null if invalid
+     */
     public static String validateAndGetFile(String ImagePath) {
         try {
             Path path = Path.of(ImagePath);
@@ -54,6 +85,12 @@ public class FilePathAdd {
         }
     }
 
+    /**
+     * Displays the prompt for file path input.
+     * 
+     * <p>Informs the user that they should enter the full path to their ISO/image file
+     * and mentions that tab completion is supported for convenience.</p>
+     */
     protected static void fileQuestion() {
         System.out.println("Please enter the FULL Path of your ISO / Image. (Tab-completion supported)");
     }