adds release sets doco

Author: nathanwoulfe

16/umbraco-workflow/release-sets/images/calendar-day.png

@@ -0,0 +1,66 @@
+---
+description: >-
+    Create collections of content to publish according to multi-stage scheduling rules.
+---
+
+# Release Sets
+
+{% hint style="info" %}
+This feature requires a license - learn more about [Workflow's licensing model](https://umbraco.com/products/umbraco-workflow)
+{% endhint %}
+
+Release Sets are collections of [Alternate Versions](../alternate-versions/alternate-versions.md), where each version can be scheduled independently. Release Sets provides a holisitic overview of scheduled content, and enables building and managing large or complex content schedules to drive digital campaigns or content roll-outs.
+
+Release Sets is currently (v16.0.0) available behind a feature flag. To enable the feature, add the following to app settings:
+
+```json
+"Umbraco": {
+    "Workflow": {
+        ... // other settings
+        "FeatureFlags": ["ReleaseSets"]
+    }
+}
+```
+
+## Working with Release Sets
+
+-   Ensure the User Group permissions are set to allow appropriate access.
+    ![Release Set permissions](images/release-set-permissions.png)
+-   Navigate to the Release Sets dashboard in the Content section
+    ![Release Set dashboard view](images/release-sets-dashboard.png)
+-   Clicking the `Create` button opens a workspace modal to create a new set.
+    ![Version workspace](images/release-set-workspace-editor.png)
+
+A Release Set is comprised of document versions and (optionally) tasks. Consider tasks as a to-do list - these are items that should be tracked alongside the Release Set, but are not necessarily CMS activities.
+
+For example, a task might be to finalise CPC advertising. It is not a CMS activity, but it is a requirement that must be met before publishing the Release Set.
+
+### Adding documents
+
+-   Click the `Add document` button
+-   Select the document node from the picker
+-   In the versions editor, either add or create a new version of the selected document
+![Version editor](images/versions-editor.png)
+-   Adding an existing version opens the version picker. Adding a new version opens the [Alternate Version](../alternate-versions/alternate-versions.md) workspace editor
+![Version picker](images/version-picker.png)
+- After selecting or creating a version, it is displayed in the version editor
+![Version editor](images/version-editor-2.png)
+- The selected version can then be scheduled
+![Version scheduling](images/version-scheduling.png)
+- Multiple versions of the same document can be added and scheduled in sequence
+![Multiple selected versions](images/version-editor-3.png)
+- After submitting the modal, the updated versions are displayed in the overlay. The documents list shows the selected documents, while the calendar shows the Release Set and its components.
+![Release Set overview](images/release-set-overview.png)
+- Selecting a day in the calendar displays the content changes scheduled for that date.
+![Calendar day](images/calendar-day.png)
+- The `Add` button in the calendar day dialog allows adding items to the Release Set, similar to the `Add document` button in the main overview.
+
+### Publishing a Release Set
+
+A Release Set can be published immediately or scheduled for future publication. To publish a Set, all assigned versions and tasks must be either `Ready to publish` (versions) or `Complete` (tasks). If all components in the Set are in the required status, it can be published by a use with the appropriate permission.
+
+Publishing content within the a Release Set is managed by a recurring hosted service, similar to scheduled content publishing.
+
+As publishing progresses, each document version will be promoted to be the current backoffice draft, then published as normal. A version of the initial backoffice draft is preserved as an Alternate Version and can be republished or edited in future.
+
+When a Release Set has no further changes to publish, the status is updated to `Complete`. The Set can then be deleted, or updated and republished. Content published within the Set is preserved and can be further edited or included in a new Release Set.