Update urls.py with user friendly landing page

Author: SilverbackOssi

payment_gateway/urls.py

@@ -16,8 +16,10 @@
 """
 from django.contrib import admin
 from django.urls import path, include
+from django.views.generic import TemplateView
 
 urlpatterns = [
     path('admin/', admin.site.urls),
     path('api/', include('payments.urls')),
+    path('', TemplateView.as_view(template_name='index.html'), name='index'),
 ]