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

docs/rating.service.md

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+# Rating service
+
+Manages ratings for items in Content Services.
+
+## Methods
+
+`getRating(nodeId: string, ratingType: any): any`<br/>
+Gets the current user's rating for a node.
+
+`postRating(nodeId: string, ratingType: any, vote: any): any`<br/>
+Adds the current user's rating for a node.
+
+`deleteRating(nodeId: string, ratingType: any): any`<br/>
+Removes the current user's rating for a node.
+
+## Details
+
+The `ratingType` string currently has two possible options, "likes"
+and "fiveStar". When the "likes" scheme is used, the result of
+`getRating` and the `vote` parameter of `postRating` are boolean
+values. When "fiveStar" is used, the value is an integer representing
+the number of stars out of five.
+
+See the [Ratings API](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/RatingsApi.md)
+in the Alfresco JS API for more information about the returned data and the
+REST API that this service is based on.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Like component](like.component.md)
+- [Rating component](rating.component.md)
+<!-- seealso end -->