[ADF-2463] Moved doc files into subfolders (#3080)

docs/content-services/tag.service.md

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+---
+Added: v2.0.0
+Status: Active
+---
+# Tag service
+
+Manages tags in Content Services.
+
+## Methods
+
+-   `getTagsByNodeId(nodeId: string): any`  
+    Gets a list of tags added to a node.  
+    -   `nodeId` - ID of the target node
+-   `getAllTheTags(): any`  
+    Gets a list of all the tags already defined in the repository.   
+
+-   `addTag(nodeId: string, tagName: string): any`  
+    Adds a tag to a node.  
+    -   `nodeId` - ID of the target node
+    -   `tagName` - Name of the tag to add
+-   `removeTag(nodeId: string, tag: string): any`  
+    Removes a tag from a node.  
+    -   `nodeId` - ID of the target node
+    -   `tag` - Name of the tag to remove
+
+## Details
+
+Content Services supports
+[tagging](http://docs.alfresco.com/5.2/tasks/site-content-tag.html)
+of file and folder nodes to assist with searches. A tag is a short
+text string added to an item, rather like a hashtag in social media.
+
+Usually, it is wise to let the user see a list of existing tags and let
+them choose one by clicking. If they type a tag name with incorrect spelling
+then it will be treated as a new tag, even though that was not intended.
+Use `getAllTheTags` to find all tags in the repository when you need to
+construct a list like this.
+
+See the
+[Tags API](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/TagsApi.md)
+in the Alfresco JS API for more information about the types returned by Tag
+service methods and for the implementation of the REST API the service is
+based on.
+
+## See also
+
+-   [Tag list component](tag-list.component.md)