[ADF-2452] Task Standalone component (#3084)

* Add a new standalone component to show when there is no form attached to a task.

docs/process-services/task-standalone.component.md

@@ -0,0 +1,38 @@
+---
+Added: v2.0.0
+Status: Active
+---
+# Task Standalone component
+
+This component can be used when there is no form attached to a task.
+
+## Contents
+
+-   [Basic Usage](#basic-usage)
+
+    -   [Properties](#properties)
+    -   [Events](#events)
+
+## Basic Usage
+
+```html
+<adf-task-standalone
+    [taskName]= "taskname">
+</adf-task-standalone>
+```
+### Properties
+
+| Name | Type | Default value | Description |
+| ---- | ---- | ------------- | ----------- |
+| taskName | `string` |  | Name of the task  |
+| isCompleted | `boolean` | `false` | If true then Task completed message is shown and `Complete` and `Cancel` buttons are hidden |
+| hasCompletePermission | `boolean` | `true` | Toggle rendering of the `Complete` button.  |
+| hideCancelButton | `boolean` | `true` | Toggle rendering of the `Cancel` button.  |
+
+### Events
+
+| Name | Type | Description |
+| ---- | ---- | ----------- |
+| cancel | `EventEmitter<void>` | Emitted when the `Cancel` button is clicked.  |
+| complete | `EventEmitter<void>` | Emitted when the form associated with the task is completed.  |
+