Docs: Add time series annotations docs (#36657)

* Docs: Add time series annotations docs

* Review

docs/sources/panels/visualizations/time-series/annotate-time-series.md

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+title = "Annotate time series"
+keywords = ["grafana", "time series panel", "documentation", "guide", "graph", "annotations"]
+weight = 200
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+
+# Annotate time series
+
+This section explains how to create annotations in the Time series panel. To read more about annotations support in Grafana please refer to [Annotations]({{< relref "../../../dashboards/annotations.md" >}}).
+
+## Add annotation
+
+1. In the dashboard click on the Time series panel. A context menu will appear.
+1. In the context menu click on **Add annotation**.
+   ![Add annotation context menu](/static/img/docs/time-series-panel/time-series-annotations-context-menu.png)
+1. Add an annotation description and tags(optional).
+   ![Add annotation popover](/static/img/docs/time-series-panel/time-series-annotations-add-annotation.png)
+1. Click save.
+
+Alternatively, to add an annotation, Ctrl/Cmd+Click on the Time series panel and the Add annotation popover will appear 
+
+## Add region annotation
+
+1. In the dashboard Ctrl/Cmd+click and drag on the Time series panel.
+   ![Add annotation popover](/static/img/docs/time-series-panel/time-series-annotations-add-region-annotation.gif)
+1. Add an annotation description and tags(optional).   
+1. Click save.
+
+## Edit annotation
+
+1. In the dashboard hover over an annotation indicator on the Time series panel.
+   ![Add annotation popover](/static/img/docs/time-series-panel/time-series-annotations-edit-annotation.gif)
+1. Click on the pencil icon in the annotation tooltip.
+1. Modify the description and/or tags.
+1. Click save.
+
+## Delete annotation
+
+1. In the dashboard hover over an annotation indicator on the Time series panel.
+   ![Add annotation popover](/static/img/docs/time-series-panel/time-series-annotations-edit-annotation.gif)
+1. Click on the trash icon in the annotation tooltip.
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