Added 'IncorrectRequestMessage' class.

Added the 'IncorrectRequestMessage' class to this project. It will be used to send the client an incorrect request message to show they did something wrong.

Projekte/mdga/model/src/main/java/pp/mdga/message/server/IncorrectRequestMessage.java

@@ -0,0 +1,58 @@
+package pp.mdga.message.server;
+
+import com.jme3.network.serializing.Serializable;
+
+@Serializable
+public class IncorrectRequestMessage extends ServerMessage {
+    /**
+     * Create IncorrectRequestMessage attributes.
+     */
+    private final int id;
+
+    /**
+     * Constructor.
+     *
+     * @param id as the id of the error message as an Integer.
+     */
+    public IncorrectRequestMessage(int id) {
+        this.id = id;
+    }
+
+    /**
+     * Constructor.
+     */
+    public IncorrectRequestMessage() {
+        this.id = 0;
+    }
+
+    /**
+     * Accepts a visitor to process this message.
+     *
+     * @param interpreter the visitor to process this message
+     */
+    @Override
+    public void accept(ServerInterpreter interpreter) {
+        interpreter.process(this);
+    }
+
+    /**
+     * Gets the bundle key of the informational text to be shown at the client.
+     * This key is used to retrieve the appropriate localized text for display.
+     *
+     * @return the bundle key of the informational text
+     */
+    @Override
+    public String getInfoTextKey() {
+        return "";
+    }
+
+    /**
+     * This method will be used to return necessary class information in a more readable format.
+     *
+     * @return information as a String.
+     */
+    @Override
+    public String toString() {
+        return "IncorrectRequestMessage with id: %d".formatted(this.id);
+    }
+}