Fixed title text and icon and added toast

lib/core/utils/app_toast.dart

@@ -0,0 +1,24 @@
+import 'package:flutter/material.dart';
+import 'package:toastification/toastification.dart';
+
+class AppToast {
+  static void success(BuildContext context, String message) {
+    toastification.show(
+      context: context,
+      type: ToastificationType.success,
+      style: ToastificationStyle.fillColored,
+      title: Text(message),
+      autoCloseDuration: const Duration(seconds: 3),
+    );
+  }
+
+  static void error(BuildContext context, String message) {
+    toastification.show(
+      context: context,
+      type: ToastificationType.error,
+      style: ToastificationStyle.fillColored,
+      title: Text(message),
+      autoCloseDuration: const Duration(seconds: 3),
+    );
+  }
+}