Added instructor availability model and admin

cntmanage/cntmanage/urls.py

@@ -2,10 +2,12 @@ from django.contrib import admin
 from django.urls import path
 from django.shortcuts import redirect
 from flightslot.admin import flightslot_user
+from flightslot.admin import flightslot_staff
 
 urlpatterns = [
     #path('', RedirectView.as_view(url='/admin/', permanent=False)),
     path('admin/', admin.site.urls),
     path('user/', flightslot_user.urls),
+    path('staff/', flightslot_staff.urls),
     path("", lambda r: redirect("/user/")),              # la root porta gli utenti nella pagina giusta
 ]