Updated 'Piece' class.

Updated the 'Piece' class by overwriting the 'toString' method in it.

Projekte/mdga/model/src/main/java/pp/mdga/game/Piece.java

@@ -121,4 +121,14 @@ public Color getColor() {
     public UUID getUuid() {
         return uuid;
     }
+
+    /**
+     * This method will return all necessary information of Piece class in a more readable way.
+     *
+     * @return information as a String.
+     */
+    @Override
+    public String toString() {
+        return "Piece with UUID: %s and color: %s with state: %s".formatted(this.uuid, color, state);
+    }
 }