Created the RandomErrorHandler to send randomized error messages from a list to the author if the message could not be found

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

@@ -0,0 +1,28 @@
+package de.gnmyt.autoresponder.handler;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class RandomErrorHandler extends NotFoundHandler {
+
+    private final ArrayList<String> messages = new ArrayList<>();
+
+    /**
+     * Constructor of the {@link RandomErrorHandler}.
+     *
+     * It sends a random error message to the author if the message could not be found
+     * @param randomErrorMessages The error messages you want to add
+     */
+    public RandomErrorHandler(String... randomErrorMessages) {
+        messages.addAll(Arrays.asList(randomErrorMessages));
+    }
+
+    @Override
+    public List<String> handleRequest(String sender, String message) {
+        Collections.shuffle(messages);
+        return Collections.singletonList(messages.get(0));
+    }
+
+}