Add stackadapt browser destination docs

src/connections/destinations/catalog/stackadapt/index.md

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+---
+# The end name should be similar to `Slack  Destination`
+title: StackAdapt Destination
+hide-boilerplate: true
+hide-dossier: true
+hidden: true
+---
+
+<!-- This template is meant for Actions-based destinations that do not have an existing Classic or non-Actions-based version. For Actions Destinations that are a new version of a classic destination, see the doc-template-update.md template. -->
+
+{% include content/plan-grid.md name="actions" %}
+
+<!-- Include a brief description of the destination here, along with a link to your website. -->
+
+<!-- This include describes the requirement of A.js 2.0 or higher for Actions compatibility, and is required if your destination has a web component. -->
+
+{% include content/ajs-upgrade.md %}
+
+<!-- In the section below, explain the value of this actions-based destination. If you don't have a classic version of the destination, remove this section. -->
+[StackAdapt](https://www.stackadapt.com){:target="_blank"} is a self-serve programmatic advertising platform for by digital marketers. Ad buyers can plan, execute and manage data-driven digital advertising campaigns across all devices, inventory, and publisher partners.
+
+## Benefits of StackAdapt (Actions)
+
+StackAdapt (Actions) provides the following benefits:
+
+- **Event & Page View Tracking**: Leverage the StackAdapt Pixel for event and page view tracking
+- **Audience Retargeting**: Use pixel data to create lookalike audiences
+- **Reporting**: Consolidate all conversion and other media metrics into one platform, for a robust reporting solution
+
+<!-- The section below explains how to enable and configure the destination. Include any configuration steps not captured below. For example, obtaining an API key from your platform and any configuration steps required to connect to the destination. -->
+
+## Getting started
+
+1. From the Segment web app, click **Catalog**, then click **Destinations**.
+2. Find the Destinations Actions item in the left navigation, and click it.
+3. Click **Configure StackAdapt**.
+4. Select an existing Source to connect to StackAdapt (Actions).
+
+<!-- The line below renders a table of connection settings (if applicable), Pre-built Mappings, and available actions. -->
+
+{% include components/actions-fields.html %}
+
+<!--
+Additional Context
+
+Include additional information that you think will be useful to the user here. For information that is specific to an individual mapping, please add that as a comment so that the Segment docs team can include it in the auto-generated content for that mapping.
+-->