Add getter to PieceDTO

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

@@ -11,4 +11,15 @@ public class PieceDTO {
         this.unicodeSymbol = unicodeSymbol;
     }
 
+    public String getType() {
+        return type;
+    }
+
+    public String getColor() {
+        return color;
+    }
+
+    public String getUnicodeSymbol() {
+        return unicodeSymbol;
+    }
 }