[ADF-1549] Added doc files for Tasklist library (#2350)

docs/task-header.component.md

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+# Activiti Task Header component
+
+Shows all the information related to a task.
+
+![adf-task-header](../docassets/images/adf-task-header.png)
+
+<!-- markdown-toc start - Don't edit this section.  npm run toc to generate it-->
+
+<!-- toc -->
+
+- [Basic Usage](#basic-usage)
+  * [Properties](#properties)
+  * [Events](#events)
+- [Details](#details)
+
+<!-- tocstop -->
+
+<!-- markdown-toc end -->
+
+## Basic Usage
+
+```html
+<adf-task-header
+    [taskDetails]="taskDetails">
+</adf-task-header>
+```
+
+### Properties
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| taskDetails | [TaskDetailsModel](#taskdetailsmodel) | | (**required**) The task details related to the task. |
+| formName | string | | The name of the form. |
+
+### Events
+
+| Name | Description |
+| --- | --- |
+| claim | Raised when the task is claimed. |
+
+## Details
+
+The purpose of the component is to populate the local variable called `properties` (array of CardViewModel), with all the information that we want to display.