Create Actions Walkthrough (#36)

* starting walkthrough docs

* versioning

docs/action-versioning.md

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+# Versioning
+
+Actions are downloaded and run from the GitHub graph of repos.  The workflow references an action use a ref.
+
+Examples:
+
+```yaml
+steps:
+    - use: actions/setup-node@74bc508
+    - user: actions/setup-node@v1
+    - uses: actions/setup-node@master
+```
+
+Binding to the immutable sha1 of a released version is the safest for stability and security.
+
+Binding to a specific major version allows for receiving critical fixes and security patches while still mainting compatibility and the assurance your workflow should still work.
+
+Binding to master is convenient but if a new major version is release which breaks compatilibility, your workflow could break.
+
+# Recommendations
+
+1. **Create a release**: use sematic versioning for the release (v1.0.9)
+2. **Update the major version tag**: move the major version tag (v1, v2, etc.) to point to the ref of the current release.
+3. **Compaitbility Breaks**:  introduce a new major version tag (v2) if changes will break existing workflows.  For example, changing inputs.
+
+See [Git-Basics-Tagging](https://git-scm.com/book/en/v2/Git-Basics-Tagging)
+
+
+