docs: Document tagged versions

docs/03-Tagged-versions.md

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+# Tagged versions
+
+Over time the SDK will introduce major changes that will change behavior;
+In order to easily use older versions we support tagged versions.
+
+There are two parts to a SDK version the scripts and the image.
+
+## Images
+
+To use an older image with the latest scripts you can set `WKDEV_SDK_TAG`, e.g.:
+
+```sh
+export WKDEV_SDK_TAG='23.04'
+wkdev-create --name='example-name'
+```
+
+As the scripts diverge from older images this *may* fail but for now should work fine.
+
+## Scripts
+
+To use older scripts you can simply checkout the branch for that tag: `git checkout tag/23.04`.
+
+This will use the `23.04` image by default but you may override it with `WKDEV_SDK_TAG`.
+
+## Creating a tag
+
+The entire process of creating a tag is automated, simply create a branch named `tag/${tag_name}`
+and CI will publish an image under that name.
+