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

docs/task-audit.directive.md

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+# Task Audit Directive
+
+Provides a way to fetch the Task Audit information in the pdf or json format.
+
+![adf-task-audit-directive](../docassets/images/adf-task-audit-directive.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
+<button
+    adf-task-audit
+    [task-id]="taskId"
+    [download]="download"
+    md-icon-button (clicked)="onAuditClick($event)" (error)="onAuditError($event)" >
+    <md-icon>assignment_ind</md-icon>
+</button>
+```
+
+### Properties
+
+| Name | Type | Default | Description |
+| --- | --- | --- | --- |
+| taskId | string | | (**required**) The id of the task. |
+| format | string | pdf | In whitch format you want the task audit information (pdf or json). |
+| download | boolean | false | True If you want download the file on the click event. |
+| fileName | string | Audit | Represent the name of the file to download in case the format is pdf. |
+
+### Events
+
+| Name | Description |
+| --- | --- |
+| clicked | Raised when the task audit info is ready |
+| error | Raised if there is an error during fetching task information |