[ADF-1586] Added Core services docs (#2629)

docs/alfresco-content.service.md

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+# Alfresco Content service
+
+Gets URLs and access info and creates folders in Content Services.
+
+## Methods
+
+`getDocumentThumbnailUrl(nodeId: any, attachment?: boolean, ticket?: string): string`<br/>
+Gets a thumbnail URL for a node.
+
+`getContentUrl(nodeId: any, attachment?: boolean, ticket?: string): string`<br/>
+Gets the URL for a node's content.
+
+`getNodeContent(nodeId: string): Observable<any>`<br/>
+Gets a node's content.
+
+`createFolder(relativePath: string, name: string, parentId?: string): Observable<FolderCreatedEvent>`<br/>
+Creates a folder.
+
+`hasPermission(node: any, permission: PermissionsEnum|string): boolean`<br/>
+Checks if the user has the specified permissions for `node`.
+
+`hasAllowableOperations(node: any): boolean `<br/>
+Checks if the the node has the `allowableOperations` property.
+
+## Details
+
+The methods that take a `node` parameter can receive the node as either a node ID string
+or as a [MinimalNode](document-library.model.md) object. You can obtain the `ticket` string,
+if you need it, from the [Authentication service](authentication.service.md). If
+`attachment` is false then the content can be viewed in the browser but not downloaded; the
+default value of true allows a download to take place.
+
+The `createFolder` method adds a folder with a given `name` within the folder at `parentId`,
+if supplied. You can use the well-known names "-my-" , "-shared-" or "-root-" as the `parentId`.
+The `relativePath` will create a sequence of folders within `parentId` with `name` as the last
+element but you can use an empty string to make the folder a direct child of `parentId`.
+
+The `hasPermission` method reports whether the node has the specified permission. (The
+[Permissions](https://github.com/Alfresco/alfresco-ng2-components/blob/development/ng2-components/ng2-alfresco-core/src/models/permissions.enum.ts)
+enum contains the values `DELETE`, `UPDATE`, `CREATE`, `UPDATEPERMISSIONS`, `NOT_DELETE`,
+`NOT_UPDATE`, `NOT_CREATE` and `NOT_UPDATEPERMISSIONS`.
+
+See the
+[Alfresco JS API](https://github.com/Alfresco/alfresco-js-api/tree/master/src/alfresco-core-rest-api)
+for more information about the low-level REST API that these methods are based on.
+
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+
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+
+
+