Add information about user authentication

README.md

@@ -8,13 +8,15 @@ This web service serves as an introduction to the stock market for users new to
 
 The app is split up into 4 sections:
 
-- **Screener:** This is where users can filter stocks by country, price, sector, and exchange.
+-  **Screener:** This is where users can filter stocks by country, price, sector, and exchange.
 
-- **Flashcards:** Users can view a list of financial terms used throughout the app.
+-  **Flashcards:** Users can view a list of financial terms used throughout the app.
 
-- **Portfolio:** Users can view a list of stocks they've invested in. They start off with $10,000 and can view how their net worth changes each day.
+-  **Portfolio:** Users can view a list of stocks they've invested in. They start off with $10,000 and can view how their net worth changes each day.
 
-- **Details:** This page shows stock information about a company as well as a detailed analysis of the stock price for short and long-term investments. This is also where users can trade stocks.
+- **Details:** This page shows stock information about a company as well as a detailed analysis of the stock price for short and long-term investments. This is also where users can trade stocks.
+
+The app also features an authentication system so users can save their portfolio and balance whenever they're logged in. Logging in is required for the Portfolio and Details view. SSO is implemented, so users' sessions can last up to 2 weeks.
 
 ## Dependencies