New fields in contact file

_Issue by **[chaddcw](https://github.com/chaddcw)** from Friday Feb 07, 2014 at 22:36 GMT_
_Originally opened as https://github.com/chaddcw/ContactManager-Example-C/issues/11_

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There is no way to easily add a new field to the contact file, or have different fields in different files. 
