@Divyajose

@alexpott ,
There is typo mistake in $role_permissions[$rid] = $entities[$rid]?->getPermissions() : [];. It should be $role_permissions[$rid] = $entities[$rid]->getPermissions() ?: [];

Updated the simplesamlphp_auth version to 4.x-dev

Changed default install to drupal 10

Added note for Ckeditor

Added Drupal core 9/10 and 9.x/10.x  

Added Drupal 10 composer create-project code.

Changed structure

Changed Drupal 10 upgrade text.

Added new points: Updating the composer file to latest 9.x ,Updating the composer file to latest Drupal 10: