Documentation on how to define service specific roles in AAI

Documentation on "feasible practices" on how to define service specific roles within Helmholtz AAI. With one specific example - the role management in Earth&Environment DataHub.

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• Sources to edit

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There is also a small hinting page from "Helmholtz AAI" subsection towards the previous page

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• Source to edit

docs/helmholtz-aai/roles.md

+# Definition of Service Specific Roles via AAI
+
+The Helmholtz AAI allows multiple ways (and any combination thereof) on how to define service specific roles for a user in the context of using one or more specific cloud service(s).
+This is based on specific attributes delivered by the central community proxy and/or the home IdP.
+
+
+!!! info
+        [Click here for an overview on **current practices** on how to implement several **use cases in the context of Helmholtz Cloud**](../service-integration/roles/README.md).
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