[ADF-1549] Added files for Core library (#2345)

* [ADF-1549] Added files for Core library

* [ADF-1549] Updated md files following checks

docs/node-permission.directive.md

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+# Node Permission directive
+
+Selectively disables an HTML element or Angular component
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic Usage](#basic-usage)
+  * [Properties](#properties)
+- [Details](#details)
+  * [HTML element example](#html-element-example)
+  * [Angular component example](#angular-component-example)
+  * [Implementing the NodePermissionSubject interface](#implementing-the-nodepermissionsubject-interface)
+  * [Defining your components as an EXTENDIBLE_COMPONENT parent component](#defining-your-components-as-an-extendible_component-parent-component)
+
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic Usage
+
+### Properties
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| adf-node-permission | [Permissions](https://github.com/Alfresco/alfresco-ng2-components/blob/master/ng2-components/ng2-alfresco-core/src/models/permissions.enum.ts) | null | Node permission to check (create, delete, update, updatePermissions, !create, !delete, !update, !updatePermissions)|
+| adf-nodes | MinimalNodeEntity[] | [] | Nodes to check permission for |
+
+## Details
+
+The `NodePermissionDirective` allows you to disable an HTML element or Angular component
+by taking a collection of the `MinimalNodeEntity` instances and checking the particular permission.
+
+The decorated element will be disabled if:
+
+- there are no nodes in the collection
+- at least one of the nodes has no expected permission
+
+### HTML element example
+
+The best example to show `NodePermissionDirective` in action is by binding DocumentList selection property to a toolbar button.
+
+For example the "Delete" button should be disabled if no selection is present or if user has no rights to delete at least one node in the selection.
+
+```html
+<adf-toolbar title="toolbar example">
+    <button md-icon-button
+            adf-node-permission="delete"
+            [adf-nodes]="documentList.selection">
+        <md-icon>delete</md-icon>
+    </button>
+</adf-toolbar>
+
+<adf-document-list #documentList ...>
+ ...
+</adf-document-list>
+```
+
+The button will become disabled by default, and is going to change its state once user selects/unselects one or multiple documents that current user has permission to delete.
+
+### Angular component example
+
+You can apply the directive on any angular component which implements the NodePermissionSubject interface. The upload drag area component can be a good candidate, since this one implements that interface. Applying the directive on an angular component is pretty much the same as applying it on an html element.
+
+```html
+<alfresco-upload-drag-area
+        [parentId]="..."
+        [versioning]="..."
+        [adf-node-permission]="'create'"
+        [adf-nodes]="getCurrentDocumentListNode()">
+ ...
+</alfresco-upload-drag-area>
+```
+
+When designing a component you want to work this directive with, you have two important things to care about.
+
+### Implementing the NodePermissionSubject interface
+
+The component has to implement the NodePermissionSubject interface which basically means it has to have a boolean **disabled** property. This is the property which will be set by the directive.
+
+```js
+import { NodePermissionSubject } from 'ng2-alfresco-core';
+
+@Component({...})
+export class UploadDragAreaComponent implements NodePermissionSubject {
+    public disabled: boolean = false;
+}
+```
+
+### Defining your components as an EXTENDIBLE_COMPONENT parent component
+
+The directive will look up the component in the dependency injection tree, up to at most one step above the current DI level (@Host). Because of this, you have to provide your component with forward referencing as the EXTENDIBLE_COMPONENT.
+
+```js
+import { EXTENDIBLE_COMPONENT } from 'ng2-alfresco-core';
+
+@Component({
+    ...
+    providers: [
+        { provide: EXTENDIBLE_COMPONENT, useExisting: forwardRef(() => UploadDragAreaComponent)}
+    ]
+})
+export class UploadDragAreaComponent implements NodePermissionSubject { ... }
+```