Create a weekend calendar

[Ed_H]

Hi. First time posting here. I have used Project for a long time but have generally been able to use it straight out of the box. When I need to add a holiday to a calendar, it's pretty easy. But now I want to create a calendar where Sat & Sun are working days, and M-F are non-working. I really don't want to go through every month and manually change the days, is there an easy way to do it?