Create VERSIONING.md

VERSIONING.md

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+# Versioning
+
+The SDK is following [Semantic Versioning 2.0](https://semver.org/spec/v2.0.0.html)
+
+## Scope
+
+As the SDK is in great parts generated from an API specification, the release notes
+may not reflect all changes in detail.
+
+In case of breaking changes they are written out separately in the release notes.
+
+A fix (e.g. wrong return type made a property not usable) which would result in
+a compile time breaking change will be treated as MINOR or PATCH version change.
+
+Other type changes (e.g. splitting a model to reflect differences between Read & Write models)
+are treated as breaking change.