Merge branch 'MA/AddTestCreditCardToReadMe' into 'main'

add test credit card details to readme

See merge request ma03081/COM3014!45

README.md

@@ -23,7 +23,7 @@ After building, you can start the services using:
 docker-compose up
 ```
 
-## Database Initialization
+## Addtional Information
 
 The database image is pre-populated with default values for testing. Currently, the database is configured with an Airline account:
 
@@ -37,3 +37,5 @@ This account manages two flights:
 
 Both flights are scheduled for 15/7/2024.
 
+
+For Booking flights with a regular user account, the credit card number used for testing this feature was `4242 4242 4242 4242`. Since the card is for testing, the expiration date and CVC can be arbitrary and will not affect the server's output.
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