Update readme

README.md

@@ -15,13 +15,16 @@ Client app for the [Invoice Ninja](https://github.com/invoiceninja/invoiceninja)
 ## Setting up the app
 
 - Initialize the config file
-`cp lib/.env.dart.example lib/.env.dart`
+
+    cp lib/.env.dart.example lib/.env.dart
 
 - Support running the code unsigned on Android
-`cp android/app/build.gradle.dev android/app/build.gradle`
+
+    cp android/app/build.gradle.dev android/app/build.gradle
 
 - Run the app
-`flutter run`
+
+    flutter run
 
 Note: if you don't have an Invoice Ninja backend setup you can test the app with these credentials: