Why would you do that? Is he going to be committing to the live database on his first day? No. Read-access, yes. Write? No.
Least privilege principle. If you don't have write access to it, you can't damage it.
And what prat just puts passwords for write-access on the production database in a document that's going to end up just-about-anywhere in six month's time?
This is my question, not "how", which you answer. WHY!?