Added Afterpay payment method integration

Author: hsngdz

packages/magento-payment-afterpay/README.md

@@ -1,4 +1,4 @@
-# Magento Payment Klarna
+# Magento Payment Afterpay
 
 Integrates GraphCommerce with the Magento Afterpay module.
 
@@ -9,7 +9,7 @@ be installed before using this package.
 
 1. Find current version of your `@graphcommerce/magento-cart-payment-method` in
    your package.json.
-2. `yarn add @graphcommerce/magento-payment-klarna@1.2.3` (replace 1.2.3 with
+2. `yarn add @graphcommerce/magento-payment-afterpay@1.2.3` (replace 1.2.3 with
    the version of the step above)
 
 This package uses GraphCommerce plugin systems, so there is no code modification