Update README.md

Author: botsman

README.md

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+| :warning: Deprecation Notice |
+|-----------------------------|
+| This repository is deprecated and is no longer maintained.  |
+| Please refer to the [documentation](https://enablebanking.com/docs/) for the relevant information. | 
+| It is advised to use [Enable Banking API](https://enablebanking.com/docs/api/reference/) for Open Banking integrations |
+
 # Open Banking Java Examples
 
 This repository contains sample Java code showing how to use Open banking APIs (PSD2 AISP & PISP) using enable:Banking Java library.