you want the ability for the user to type in a name and that name will be added to the address book and it's saved even after the program is closed (i think i got that right)?
saving info to files is easy, it just depends on what type of file (text, csv, database, xml, etc..)
personally i would use a database for this (the addressbook program i wrote a couple of months ago uses an Access DB) storing the names and info in a table
if not using a DB then i would suggest a csv file instead
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