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

docs/breadcrumb.component.md

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+# Breadcrumb Component
+
+Indicates the current position within a navigation hierarchy.
+
+![Breadcrumb](../docassets/images/breadcrumb.png)
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic Usage](#basic-usage)
+  * [Properties](#properties)
+  * [Events](#events)
+
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic Usage
+
+```html
+<adf-breadcrumb
+    [target]="documentList"
+    [folderNode]="documentList.folderNode">
+</adf-breadcrumb>
+```
+
+### Properties
+
+| Name | Type | Description |
+| --- | --- | --- |
+| target | DocumentListComponent | (optional) DocumentList component to operate with. Upon clicks will instruct the given component to update. |
+| folderNode | [MinimalNodeEntryEntity](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/NodeMinimalEntry.md) | Active node, builds UI based on `folderNode.path.elements` collection. |
+| root | string |  (optional) Name of the root element of the breadcrumb. You can use this property to rename "Company Home" to "Personal Files" for example. You can use i18n resource key for the property value. |
+| rootId | string | (optional) The id of the root element. You can use this property to set a custom element the breadcrumb should start with. |
+
+### Events
+
+| Name | Returned Type | Description |
+| --- | --- | --- |
+| navigate | [PathElementEntity](https://github.com/Alfresco/alfresco-js-api/blob/master/src/alfresco-core-rest-api/docs/PathElementEntity.md) | emitted when user clicks on a breadcrumb  |