Add a short document about a Veraison demo

examples/veraison/README.md

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+Islet can cooperate with the external verification service implemented in scope of the Veraison project (https://github.com/veraison).
+The separate repository `https://github.com/Samsung/islet-ra` provides all necessary tools and libraries required for development
+of realm and reliant party applications that utilize Veraison verification service. To demonstrate how to setup and run such a
+remote attestation scenarios, please clone the `https://github.com/Samsung/islet-ra` repository, and
+follow the instructions presented in https://github.com/Samsung/islet-ra/blob/main/examples/veraison/README.md