New method getMoveListSize in ChessEngine

schach/src/main/java/de/hs_mannheim/informatik/chess/model/ChessEngine.java

@@ -104,6 +104,8 @@ public class ChessEngine {
     
     public int getCurrentMoveIndex() { return currentMoveIndex; }
     
+    public int getMoveListSize() { return moves.size(); }
+    
     private PieceDTO convertPieceToDTO(Piece piece) {
         if (piece == null || piece.equals(Piece.NONE)) return null;
         String color = piece.name().startsWith("WHITE") ? "WHITE" : "BLACK";