Add calver transition document

docs/guides/calver-transition.md

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+# Devtools Projects Transitioning to CalVer Releases
+
+Projects in the devtools space will be switching to [CalVer](https://calver.org/)
+releases over the next few weeks. This is a surprising change, so let's get into
+what that means.
+
+## What
+
+These are the projects that will be transitioning to CalVer:
+
+- ansible-compat
+- ansible-creator
+- ansible-dev-environment
+- ansible-lint
+- ansible-navigator
+- creator-ee
+- molecule
+- pytest-ansible
+- tox-ansible
+- vscode-ansible
+
+We will use a `YY.MM.MICRO` version format. Thus, a release for March 2025 will be
+named `25.3.0`, and if a patch (ie, non-feature) release is required for that release,
+it will be named `25.3.1`, even if it is released in April, and the month will not
+increment until a new version with features or other significant changes is released.
+
+## Why
+
+This is a bit of a change so let's go over what we hope to accomplish with it.
+
+- Predictable, transparent release cadence
+
+  With this, we are committing to time-based releases for all projects.
+  While the exact frequency will vary between projects, each will have a release
+  between one and three months after the last feature release.
+
+- Version number indicates the age of a release
+
+  With CalVer, the age of a release can be trivially determined from the version
+  number, instead of having to look up the release notes as at present.
+
+- Easier to translate versions between tools
+
+  Many of our tools are interrelated. A consistent version scheme allows one to
+  have a good idea of how related but independent tools are expected to work together.
+
+## How
+
+Following this announcement, the next feature release in each project will
+be a CalVer release.
+
+Feature releases will not happen more often than once a month, though
+patch releases may happen more often as needed. We will also make
+releases at least once every three months for each project.
+
+Releases will still split out changes by category, including new features,
+bugfixes, documentation updates, announced deprecations, and removed features.
+
+One of the things we are bringing with this change is an emphasis on fewer
+breaking changes / more emphasis on deprecation cycles and overlapping features.
+When something is deprecated, it will be called out in the release notes, along
+with replacement and how long the feature will remain in place.
+
+## What's Next
+
+As mentioned, this change will begin rolling out over the next few weeks. However,
+if you have any comments or concerns, please let us know.