Update decision_records.md

docs/adr/decision_records.md

@@ -11,3 +11,10 @@ Refer to [ticket #3](https://github.com/eclipse-digitaltwin/aas4j/issues/11) - d
 - 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.
+
+
+## Versioning for Milestone Release / Preview / Release Candidates
+
+- Decision for "1.0.0-milestone-01"
+
+- Future versions of the pre-relesease can be "1.0.0-milestone-02"