Create ReleasingWizard.md (#323)

docs/ReleasingWizard.md

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+# Wizard Web UI Release Docs
+
+## Creating a release
+
+Usually a release of the Web UI will be accompanied by changes to the bicep code. In which case a new symantic release tag needs to be chosen (0.8.2 or 0.8.5 etc).
+There is a [GitHub action workflow](https://github.com/Azure/AKS-Construction/actions/workflows/release.yml) which is initiated manually but automates the release, all that needs to be provided is the new release tag.
+
+## Releasing just the Web UI
+
+Occassionally there will be UI improvements that we want to release that do not have any dependencies in a new release.
+For these scenarios, we use the same [GitHub action workflow](https://github.com/Azure/AKS-Construction/actions/workflows/release.yml) but choose not to create a new release. Instead, just repeating the release tag that is current.
+
+## Rolling back the release
+
+When the release workflow runs, it stores assets of the UI and bicep code in zip files.
+If we need to rollback a *bad release* then process is as follows
+
+1. In the [GitHub action workflow](https://github.com/Azure/AKS-Construction/actions/workflows/release.yml) history, locate the release you want to rollback to. 
+2. Download the artifact zip for the `WizardApp`
+3. In you local git environment checkout the `gh-pages` branch
+4. Extract the contents of the artifact zip over the top of branch
+5. Commit and push to the `gh-pages` branch.
+6. Wait for GitHub to process the new branch and release the app