Added RollersCount serialization

RollersCount.java

@@ -1,5 +1,18 @@
 public enum RollersCount {
     Four,
     Five,
-    Six
+    Six;
+
+    public int getValue() {
+        return switch (this) {
+            case Four -> 4;
+            case Five -> 5;
+            case Six -> 6;
+        };
+    }
+
+    @Override
+    public String toString() {
+        return Integer.toString(getValue());
+    }
 }