[ADF-4152] Updated folder structure of core docs (#4415)

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Moved core library docs into subfolders

* [ADF-4152] Manual fixes to core doc file links

* [ADF-4152] Further automatic + manual link tidying

docs/core/services/ecm-user.service.md

@@ -0,0 +1,42 @@
+---
+Title: Ecm User service
+Added: v2.0.0
+Status: Active
+Last reviewed: 2018-11-19
+---
+
+# [Ecm User service](../../../lib/core/userinfo/services/ecm-user.service.ts "Defined in ecm-user.service.ts")
+
+Gets information about a Content Services user.
+
+## Class members
+
+### Methods
+
+-   **getCurrentUserInfo**(): [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmUserModel`](../../core/models/ecm-user.model.md)`>`<br/>
+    Gets information about the user who is currently logged-in.
+    -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmUserModel`](../../core/models/ecm-user.model.md)`>` - User information as for getUserInfo
+-   **getUserInfo**(userName: `string`): [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmUserModel`](../../core/models/ecm-user.model.md)`>`<br/>
+    Gets information about a user identified by their username.
+    -   _userName:_ `string`  - Target username
+    -   **Returns** [`Observable`](http://reactivex.io/documentation/observable.html)`<`[`EcmUserModel`](../../core/models/ecm-user.model.md)`>` - User information
+-   **getUserProfileImage**(avatarId: `string`): `string`<br/>
+    Returns a profile image as a URL.
+    -   _avatarId:_ `string`  - Target avatar
+    -   **Returns** `string` - Image URL
+
+## Details
+
+The class returned by `getUserInfo` and `getCurrentUserInfo` is detailed
+in the [Ecm User model docs](../models/ecm-user.model.md). The `avatarId` passed to
+`getUserProfileImage` is available as a field of the [`EcmUserModel`](../../core/models/ecm-user.model.md) 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.
+
+## See also
+
+-   [Bpm user service](../services/bpm-user.service.md)
+-   [Ecm user model](../models/ecm-user.model.md)