Created the CustomHandlersExample

src/examples/java/CustomHandlersExample.java

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+import de.gnmyt.autoresponder.SimpleAutoResponder;
+import de.gnmyt.autoresponder.commands.usage.UsageException;
+import de.gnmyt.autoresponder.commands.usage.handler.SimpleUsageErrorHandler;
+import de.gnmyt.autoresponder.commands.usage.handler.UsageHandler;
+import de.gnmyt.autoresponder.exceptions.ResponderException;
+import de.gnmyt.autoresponder.handler.*;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+
+public class CustomHandlersExample {
+
+    public static void main(String[] args) throws ResponderException {
+
+        // Create an instance of the SimpleAutoResponder
+        SimpleAutoResponder autoResponder = new SimpleAutoResponder();
+
+        // Here you can set the "not found handler".
+        // You can use it to send specific replies if the provided message could not be identified by a listener or command
+
+        // The random error handler. Use it to send random messages if the message could not be found
+        autoResponder.useNotFoundHandler(new RandomErrorHandler("Error message 1", "Error message 2", "Error message 3"));
+
+        // The default error handler. Use it to send all message to the user if the message could not be found
+        autoResponder.useNotFoundHandler(new SendErrorHandler("First message", "Second message", "Third message"));
+
+        // The "send nothing" handler. Use it to send no message if the message could not be found (default)
+        autoResponder.useNotFoundHandler(new SendNothingHandler());
+
+        // The dialogflow error handler. Use it to send the message directly to dialogflow if it could not be found
+        autoResponder.useNotFoundHandler(new DialogflowHandler(new File("credentials.json")));
+
+        // Or create your own handler (you can also create an own class for the handler)
+        autoResponder.useNotFoundHandler(new NotFoundHandler() {
+            @Override
+            public List<String> handleRequest(String sender, String message) {
+                return new ArrayList<>(Arrays.asList("Hello " + sender + ".", "You wrote " + message));
+            }
+        });
+
+
+        // There is also a handler for the unexpected usage
+
+        // Here is the default handler. It just sends the reason into the chat (default)
+        autoResponder.useCommandUsageHandler(new SimpleUsageErrorHandler());
+
+        // But you can also create your own handler
+        autoResponder.useCommandUsageHandler(new UsageHandler() {
+            @Override
+            public List<String> handleUsageException(UsageException exception) {
+                String reason;
+
+                switch (exception.getExceptionType()) {
+                    case NOT_IN_ALLOWED_VALUES:
+                        reason = "You are not allowed to use this value";
+
+                        // Here you can add all cases to change the message or for example the language
+
+                    default:
+                        reason = "An unexpected error happened";
+                }
+
+                return new ArrayList<>(Collections.singletonList(reason));
+            }
+        });
+
+        // Now you can start the auto responder
+        autoResponder.start();
+    }
+
+}