Add or Import Contacts
Type in contacts details one by one or even import existing contacts from Microsoft Excel, Outlook or a CSV file.
You can save names, email addresses, phone numbers, and more in Contacts.
From a file :Check that you saved your contacts as a .csv or .vcf file. Then click CSV or vCard file
If you email someone but you haven't added them as a contact, Contacts automatically saves their email address in your "Other Contacts" group. Their email address will show up the next time you email them.
In the "Create contacts for auto-complete" section, select I'll add contacts myself.
If you're on an iPhone, iPad, or Android device, you won't see Other Contacts.
To select contacts, check the boxes that appear next to their names.