Added Spec

Author: DavidGinzberg

README.md

@@ -1,2 +1,38 @@
 # project-2-ATM
 Week 2 project: ATM Simulator
+
+## ATM Requirements
+
+Every feature must have corresponding unit tests
+Tests should demonstrate proper behavior, and proper handling of misuse (eg attempts to deposit/transfer/withdraw negative amounts
+
+- User interface: CLI Only
+  - Direct Input
+  - Numbered options (instead of on-screen buttons)
+  - ASCII art welcome but not required
+- Must support account types:
+  - Checking
+  - Savings
+  - Investment
+- Account Actions
+  - Withdraw from acct
+  - Deposit to acct
+  - Transfer across accounts (self)
+  - Open new account
+  - Close account (must be empty)
+  - Print transaction history
+  - Check balance
+  - **Challenge:** Transfer to another user's account (but not from)
+- Support multiple users
+  - Users have associated accounts
+  - Can create new user
+  - Users are authenticated with a password (generated or provided on user creation)
+  - Can exit a user and enter another user
+- **BONUS** Persistence
+  - Users and accounts remain persistent
+  - Opportunity for research
+
+Recommended:
+
+Create a `UserInputHandler` class that manages all input requests to the user; Extend this with a `DummyUserInputHandler` for testing (provide scripted user input using this object)
+