SQL Server AlwaysON- Login Sync Utility/Script

Team,
We have a synchronous Always ON AG configured in our environment. I was looking for the best practices to have the logins sync if there are any additions. Also the way the application is configured is they have the ability to perform the db additions and
sync them to AoAG group. However the challenge here is orphaned users.
Can we make these databases contained databases on AlwaysON? If so please do recommend the best practices. 
Thanks for your assist.
Best Regards,
Sharath

Hi,
Hope it helps.
http://dba.stackexchange.com/questions/30036/how-to-link-users-and-logins-in-an-availability-group

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