fixed issue with GIF and screenshots not showing/loading in README.md and properly formatted codebase

Author: VhiktorBrown

README.md

@@ -1,5 +1,5 @@
 ## :moneybag: Paystack Package for Flutter
-The Flutter package that makes it super easy to integrate Paystack's payment gateway into your app with just few lines of code.
+The Flutter package that makes it super easy to integrate Paystack's payment gateway into your app with just few lines of code. Payment Options like Card, Bank Transfer, USSD, Mobile Money, etc.
 
 <img src="https://raw.githubusercontent.com/VhiktorBrown/paystack_flutter/master/gif/paystack_flutter_flow.gif" width="300" height="550" alt=""/>