[ADF-1586] Added Content Services doc files (#2683)

docs/tag.service.md

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+# Tag service
+
+Manages tags in Content Services.
+
+## Methods
+
+`getTagsByNodeId(nodeId: string): any`<br/>
+Gets a list of tags added to a node.
+
+`getAllTheTags()`<br/>
+Gets a list of all the tags already defined in the repository.
+
+`addTag(nodeId: string, tagName: string): any`<br/>
+Adds a tag to a node.
+
+`removeTag(nodeId: string, tag: string): any`<br/>
+Removes a tag from a node.
+
+## 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.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Tag list component](tag-list.component.md)
+<!-- seealso end -->
+
+
+