Update readme.md to include link to pre-authorization blogpost

authorisation-adjustment-example/readme.md

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 This repository includes an adjust authorisation example for the following three use cases after a pre-authorised payment: incremental, decremental adjustments. Within this demo app, you'll find a simplified version of a hotel booking, where the shopper perform a booking and administrators can **[1] adjust** (increase/decrease) the payment amount, **[2] extend** the authorisation expiry date, **[3] capture** the final amount and **[4] reverse** (cancel or refund) an authorised payment
 
+> **Note:** We've included a technical [blog post](https://www.adyen.com/knowledge-hub/pre-authorizations-and-authorization-adjustments-for-developers) that explains every step of this demo.
+
 ![Authorisation Adjustment Demo](wwwroot/images/cardauthorisationadjustment.gif)
 
 This demo leverages Adyen's API Library for .NET ([GitHub](https://github.com/Adyen/adyen-dotnet-api-library) | [Docs](https://docs.adyen.com/development-resources/libraries?tab=c__5#csharp)).