[ADF-1586] Added docs for services (#2619)

* [ADF-1586] Added docs for services

* [ADF-1586] Removed model definitions from docs

docs/ecm-user.service.md

@@ -0,0 +1,33 @@
+# Ecm User service
+
+Gets information about a Content Services user.
+
+## Methods
+
+`getUserInfo(userName: string): Observable<EcmUserModel>`<br/>
+Gets information about a user identified by their username.
+
+`getCurrentUserInfo(): Observable<EcmUserModel>`<br/>
+Gets information about the user who is currently logged-in.
+
+`getUserProfileImage(avatarId: string)`<br/>
+Returns a profile image as a URL.
+
+## Details
+
+The class returned by `getUserInfo` and `getCurrentUserInfo` is detailed
+in the [Ecm User model docs](ecm-user.model.md). The `avatarId` passed to
+`getUserProfileImage` is available as a field of the `EcmUserModel` instance
+returned for a particular person.
+
+See the
+[getPerson](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/PeopleApi.md#getPerson)
+method in the Alfresco JS API for more information about the REST calls used by this service.
+
+<!-- Don't edit the See also section. Edit seeAlsoGraph.json and run config/generateSeeAlso.js -->
+<!-- seealso start -->
+## See also
+
+- [Bpm user service](bpm-user.service.md)
+- [Ecm user model](ecm-user.model.md)
+<!-- seealso end -->