[ADF-1549] Added docs for Upload, Userinfo, Viewer and Webscript (#2359)

docs/start-task.component.md

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+# Start Task Component
+
+Creates/Starts new task for the specified app
+
+![adf-start-task](../docassets/images/adf-start-task.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-start-task
+    [appId]="YOUR_APP_ID">
+</adf-start-task>
+```
+
+### Properties
+
+| Name | Type | Description |
+| --- | --- | --- |
+| appId | string | (**required**): The id of the app. |
+
+### Events
+
+| Name | Description |
+| --- | --- |
+| success | Raised when the task is successfully created |
+| cancel | Raised when the cancel button is pressed by the user |
+| error | Raised if there is an error during task creation |