You can pre-populate user contact lists with the Bulk Administration Tool (BAT). The first step is to create a CSV file that defines the contact list you want to provide to users. You then use the BAT to import that contact list in bulk to a set of users.
In this way you can pre-populate contact lists for users so that they automatically have a set of contacts after the initial launch of the client.
For more information about using BAT and the format of the CSV file, see the Deployment Guide for Cisco Unified Presence.