code: public static void addEntry(File zip, String path, byte[] bytes, File destZip) {
      addEntry(zip, new ByteSource(path, bytes), destZip);
    }
docs: Copies an existing ZIP file and appends it with one new entry.
  
  @param zip
  an existing ZIP file (only read).
  @param path
  new ZIP entry path.
  @param bytes
  new entry bytes (or <code>null</code> if directory).
  @param destZip
  new ZIP file created.