Merge pull request #1813 from Adyen/chore/twint-docs

Add Twint to payment methods docs readme

docs/payment-methods/README.md

@@ -7,3 +7,4 @@ Please see the list of documentation below:
 | [Address lookup for cards](CARD_ADDRESS_LOOKUP.md) | Additional address configuration which allows suggesting addresses to the shopper when they enter data into the address input |
 | [French meal vouchers](FRENCH_MEAL_VOUCHER.md)     | Implementation guide for French meal vouchers                                                                                 |
 | [Gift cards](GIFT_CARD.md)                         | Implementation guide for Gift cards                                                                                           |
+| [Twint](TWINT.md)                                  | Implementation guide for Twint                                                                                                |