[ADF-1549] Initial files for new doc format (#2342)

docs/sites-dropdown.component.md

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+# Sites Dropdown component
+
+Displays a dropdown menu to show and interact with the sites of the current user.
+
+![Dropdown sites](../docassets/images/document-list-dropdown-list.png)
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic Usage](#basic-usage)
+  * [Events](#events)
+
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic Usage
+
+```html
+ <adf-sites-dropdown
+  (change)="getSiteContent($event)">
+ </adf-sites-dropdown>
+```
+
+### Events
+
+| Name | Returned Type | Description |
+| --- | --- | --- |
+| change | [SiteModel](https://github.com/Alfresco/alfresco-ng2-components/blob/master/ng2-components/ng2-alfresco-core/src/models/site.model.ts) | emitted when user selects a site. When default option is selected an empty model is emitted  |