Created the SendErrorHandler. Useful to send custom error messages to the user whenever the message could not be found

src/main/java/de/gnmyt/autoresponder/handler/SendErrorHandler.java

@@ -0,0 +1,25 @@
+package de.gnmyt.autoresponder.handler;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+public class SendErrorHandler extends NotFoundHandler {
+
+    private final ArrayList<String> messages = new ArrayList<>();
+
+    /**
+     * Constructor of the {@link SendErrorHandler}.
+     *
+     * It sends error message sto the author if the message could not be found
+     * @param errorMessages The error messages you want to send
+     */
+    public SendErrorHandler(String... errorMessages) {
+        messages.addAll(Arrays.asList(errorMessages));
+    }
+
+    @Override
+    public List<String> handleRequest(String sender, String message) {
+        return messages;
+    }
+}