added further notification implemenation

Projekte/mdga/model/src/main/java/pp.mdga/notification/SelectableShieldNotification.java

@@ -0,0 +1,34 @@
+package pp.mdga.notification;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Notification for selecting pieces for swapcard.
+ */
+public class SelectableShieldNotification extends Notification{
+
+    /**
+     * List of UUIDs representing the player's own pieces available for selection.
+     */
+    private final List<UUID> ownPieces;
+
+
+    /**
+     * Constructs a notification for selecting pieces for swapcard.
+     *
+     * @param ownPieces   the list of the player's own pieces
+     */
+    public SelectableShieldNotification(List<UUID> ownPieces) {
+        this.ownPieces = ownPieces;
+    }
+
+    /**
+     * Gets the list of the player's own pieces available for selection.
+     *
+     * @return a list of UUIDs representing the player's own pieces
+     */
+    public List<UUID> getOwnPieces() {
+        return ownPieces;
+    }
+}