Versioning.md

@@ -23,7 +23,7 @@ Use a git tag `1.2.3` to set a version. For development build, it will add a uni
 **IMPORTANT**, for correct version handling, make sure to tag your versions regularly. Our gitlab runners only check-out the last 50 commits (excluding merge commits). So if the distance is more than 50, your development versions will be inconsistent!
 
 Check out the following package for a concrete example in use:
-[ASTRONauth](https://git.astron.nl/astron-sdc/astronauth)
+[ASTRONauth](https://git.astron.nl/astron-sdc/astronauth):
 
 ```toml
 # pyproject.toml
@@ -46,5 +46,20 @@ ignore = "_version.py"
 # also add it to your .gitignore!
 ```
 
+```python
+# astronauth/__init__.py
+
+try:
+    from importlib import metadata
+except ImportError:  # for Python<3.8
+    import importlib_metadata as metadata
+
+try:
+    __version__ = metadata.version("astronauth")
+except metadata.PackageNotFoundError:
+    # In case not installed (during development)
+    __version__ = "Unknown"
+```
+
 ## License
 The [Semantic Versioning specification](https://semver.org/) was originally authored by Tom Preston-Werner and is licensed under [Creative Commons -- CC BY 3.0](https://creativecommons.org/licenses/by/3.0/)
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