Added file Import-StoredCreds

-Name may be changed later to match better with legal verbs + an actual
description

-File gathers a windows user's username, checks for a previously created
credential file. If the file is not there, prompts user for password
associated with that username. Hashes the password and stores it in a
file for later use.

-Calls file and stores password into memory for use in other scripts

-To do: add description in comments for file