Added initial listrak documentation.

Author: jongohn

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

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+---
+title: Listrak Destination
+id: <integration_id>
+---
+
+{% include content/plan-grid.md name="actions" %}
+
+> info ""
+> The Listrak Destination is in beta, and Listrak is still developing the source. To join Listrak's beta program or to give any feedback to help improve the Listrak Destination and its documentation, [let Listrak know](mailto:[email protected]).
+
+[Listrak](https://www.listrak.com/?utm_source=segmentio&utm_medium=docs&utm_campaign=partners){:target="_blank”} is the retail industry’s leading customer engagement platform. Listrak delivers results for more than 1,000 retailers by providing best-in-class email, text message marketing, identity resolution marketing and push notifications through seamless cross-channel orchestration. Listrak’s data-first approach delivers 1:1 personalization at scale so you can send messages at precisely the right time across the right combination of channels and devices to maximize customer engagement, revenue, and lifetime value.
+
+This destination is maintained by Listrak. For any issues with the destination, [contact their Support team](mailto:[email protected]).
+
+> (delete after reading) 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 your Segment workspace, go to **Connections > Catalog** and click **Destinations**.
+2. Search for **Listrak** in the Destinations Catalog and select the destination.
+3. Click **Configure Listrak**.
+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 <desintation_name>**.
+4. Select an existing Source to connect to <destination_name> (Actions).
+
+> (delete after reading) The line below renders a table of connection settings (if applicable), Pre-built Mappings, and available actions.
+
+{% include components/actions-fields.html %}
+
+
+> (delete after reading) 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.
+
+
+---