chore: update README to include information about permanent regions (#…

…108)

README.md

@@ -25,3 +25,20 @@ Test regions are designated for Continuous Integration (CI) tests and are delete
 |------------|------------|
 | EU (London)| eu-west-2  |
 | EU (Paris) | eu-west-3  |
+
+### Permanent Regions
+
+These regions are designated for so-called permanent resources like S3 buckets, lambda functions, reference architectures... anything that is out of the scope of testing.
+
+These are not cleaned up by the mentioned CI test above.
+
+Here we differentiate between the use cases and have reference architectures outside of other permanent resources. This allows to potentially clean things up easier and have a better understanding on what belongs where.
+
+All of this is kept in [Terraform](https://github.com/camunda/infraex-terraform/tree/main/aws).
+
+#### AWS Regions
+
+| Region        | Identifier    | Use Case                |
+|---------------|---------------|-------------------------|
+| EU (Frankfurt)| eu-central-1  | permanent resources     |
+| EU (Ireland)  | eu-west-1     | reference architectures |