Update README.md

README.md

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-# .github
+# .github
+
+Reusable workflows found in `.github/workflows`.
+GitHub does not distinguish workflows that should run in this repository,
+from reusable workflows that are expected to be called elsewhere.
+The only way to tell is that reusable workflows include `workflow_call` event trigger.
+
+## Releasing
+
+Reusable workflows, like actions, should have a `vMajor` git ref 
+such that consumers may pin to a fuzzy version and avoid receiving breaking changes.
+To that end, the `tag-major` workflow will ensure a `vMajor` ref is kept up to date 
+in response to pushed tags.
+
+It is recommended in this repository to trigger a release by manually create a GitHub Release,
+choosing the next version tag, and publishing (ideally using the generated release notes).