[ADF-1549] Added doc files for Processlist library (#2353)

docs/process-instance-header.component.md

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+# Process Instance Details Header component
+
+Sub-component of the process details component, which renders some general information about the selected process.
+
+![adf-process-instance-header](../docassets/images/adf-process-instance-header-attachment.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-process-instance-header   
+    processInstance="localProcessDetails">
+</adf-process-instance-details>
+```
+
+### Properties
+
+| Name | Type| Description |
+| --- | --- | --- |
+| processInstance | [ProcessInstanceModel](https://github.com/Alfresco/alfresco-ng2-components/blob/master/ng2-components/ng2-activiti-processlist/src/models/process-instance.model.ts) | (**required**): Full details of the process instance to display information about |
+
+#### Events
+
+This component does not define any events.