Improve clubs selection in the user admin

tournaments/admin.py

@@ -20,6 +20,7 @@ class CustomUserAdmin(UserAdmin):
     add_form = CustomUserCreationForm
     model = CustomUser
     search_fields = ['username', 'email', 'phone', 'first_name', 'last_name', 'licence_id']
+    filter_horizontal = ('clubs',)
 
     list_display = ['email', 'first_name', 'last_name', 'username', 'date_joined', 'latest_event_club_name', 'is_active', 'event_count', 'origin', 'registration_payment_mode', 'licence_id']
     list_filter = ['is_active', 'origin']