[ADF-2463] Moved core components to subfolder (#3062)

docs/core/accordion-group.component.md

@@ -0,0 +1,59 @@
+---
+Added: v2.0.0
+Status: Active
+---
+# Accordion Group component
+
+Adds a collapsible panel to an accordion menu.
+
+![Accordion menu screenshot](../docassets/images/accordion-menu.png)
+
+## Basic Usage
+
+```html
+<adf-accordion>
+    <adf-accordion-group [heading]="titleHeading" [isSelected]="true" [headingIcon]="'assignment'" [headingIconTooltip]="'Group Tooltip'">
+        <my-list></my-list>
+    </adf-accordion-group>
+</adf-accordion>
+```
+
+```ts
+@Component({
+    selector: 'my-component'
+})
+export class MyComponent implements OnInit {
+
+    titleHeading: string;
+
+    constructor() {
+        this.titleHeading = 'My Group';
+    }
+
+}
+```
+
+### Properties
+
+| Name | Type | Default value | Description |
+| ---- | ---- | ------------- | ----------- |
+| heading | `string` |  | Title heading for the group.  |
+| headingIcon | `string` |  | The material design icon.  |
+| headingIconTooltip | `string` |  | Tooltip message to be shown for headingIcon  |
+| hasAccordionIcon | `boolean` | `true` | Should the (expanded) accordion icon be shown?  |
+| isOpen | `boolean` |  | Is this group currently open?  |
+| isSelected | `boolean` |  | Is this group currently selected?  |
+
+### Events
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| headingClick | `EventEmitter<any>` | Emitted when the heading is clicked. |
+
+## Details
+
+Place one or more accordion groups within an [Accordion component](accordion.component.md) to define a menu. 
+
+## See also
+
+-   [Accordion component](accordion.component.md)