Practice for an OO Ruby Program.

Commands:
user <name> -- Adds a user
add <name> <number> -- Adds a credit card to a user
pay <actor> <target> <amount> <note> -- Creates a transaction between two users. Amount must be in the for $x.xx
balance <name> -- Outputs the balance of a user's account
feed <name> -- Outputs all the transactions of a user

Also accepts a file as a command line argument to the executable in the bin folder