The easiest way it to use the built in field mapping between entity relationships. Out of the box there should already be a mapping from the Account address to the Contact address. In order for this to work, you need to create your Contact record from inside the Account record. You are able to add/change these mappings under the mappings for the specific relationship.
Otherwise you could set the values using a workflow that grabs the values from the Parent Account.
If you aren't creating Contacts from within the context of the Account - you can add JavaScript or create a plugin to populate the values.