Create documentation of Architectural Decision Records

docs/adr/decision_records.md

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+# Architectural Decisions Records
+
+## Handling the package structures of AAS4J
+
+Refer to [ticket #3](https://github.com/eclipse-digitaltwin/aas4j/issues/11) - decision is:
+
+- Considering only final versions of the model 
+
+- Release vX.Y.Z with namespace ...v3... used for all components, i.e. ...v3.model...., ...v3.dataformat.json..., ...v3.validator... etc.
+
+- Upon release of next final version v4 of specification: Release v(X+1).Y.Z with namespace ...v4... used for all components, remove all ...v4... namespaces
+
+- If an application wants to support v3 and v4 it can include dependencies with vX.Y.Z and v(X+1).Y.Z.