Bank Ledger Console Application

Functions:

1. Check balance
2. Record a deposit
3. Record a withdrawal
4. Check transaction history
5. Log Out
   1. Once logged in, type log to log out

Database

The Database is in-memory, using Dictionaries as tables for the data. The username of each user is unique so it acts as the ID between the tables.

1. There are 3 main datasets.
   1. _user : Hold all the users in the application
   2. _userBalance : Holds the current balances of each user
   3. _transactionHistory : A Dictionary of inner dictionaries that use the username of a user as an ID and displays the transaction histories of each user.