add 08

Author: Francesco Calcavecchia

pycon-de-2025/08-semantic_versioning/READM.md

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+# Semantic Versioning
+
+Semantic versioning for data:
+
+| Increase of ... | Meaning | | --------------- | ---------------- | | Major | Change of Schema | | Minor | New Data | |
+Patch | Fix Data Values |
+
+A good example can be found
+[here](https://gitlab.com/data-as-code/energy-dac-example/-/tree/b3a947b6c18b9b059bf9c72874cd6e87c98d4fdc).