readme formatting

README.md

@@ -4,17 +4,17 @@
 A bank app where you can make deposits and withdrawals, and see a statement of the transactions with dates and running balance. 
 
 ## How to use
-
-### How to use the app
-`irb`
-`require './app.rb'`
-> create a new account
+```
+irb
+require './app.rb'
+```
+create a new account:
 `a = BankAccount.new`
-> make a deposit, include amount and date
+make a deposit, include amount and date: 
 `a.deposit(1000, "14-01-2020")`
-> make a withdrawal, include amount and date
+make a withdrawal, include amount and date: 
 `a.withdraw(10, "15-01-2020")`
-> print a statement
+print a statement: 
 `a.print_statement`
 
 ### How to run the tests