Update README.md

Author: ipinak

README.md

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 viva-wallet is an SDK for connecting to the payment provider Viva Wallet.
 
+[![Get started with TechPals](./cover.jpg)](https://techpals.eu/?utm_source=viva-wallet-go&utm_medium=github)
+
 ## Supported Endpoints
 
 - [Authentication (OAuth)](https://developer.vivawallet.com/apis-for-payments/payment-api/#section/Authentication)