Add Postscript Destination doc

src/connections/destinations/catalog/actions-postscript/index.md

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+---
+title: Postscript Destination
+id: 66f2b0818aa856d4d2d87f90
+---
+
+{% include content/plan-grid.md name="actions" %}
+
+[Postscript](https://postscript.io/?utm_source=segmentio&utm_medium=docs&utm_campaign=partners){:target="_blank"} empowers ecommerce brands to drive incremental revenue through SMS marketing. With tools for subscriber growth, personalized messaging, and performance tracking, Postscript helps businesses engage their audience and boost conversions.
+
+This integration enables you to sync your Segment Engage Audiences to Postscript, allowing you to target SMS marketing campaigns to specific customer segments. You can automatically update subscriber lists in Postscript based on audience membership changes in Segment, ensuring your SMS campaigns always reach the right customers. The integration supports syncing users identified by email address or phone number only.
+
+This destination is maintained by Postscript. For any issues with the destination, [contact their Support team](mailto:support@postscript.io).
+
+## Getting started
+
+1. From your workspace's [Destination catalog page](https://app.segment.com/goto-my-workspace/destinations/catalog){:target="_blank"} search for *Postscript*.
+2. Select **Postscript** and click **Add Destination**.
+3. Select an existing Source to connect to Postscript (Actions).
+4. Go to the [Postscript app](https://app.postscript.io/){:target="_blank"}.
+5. Select your Shop name in the left sidebar, then select **API**.
+6. Select **Create Security key Pair** on the top right side of the page, then confirm your action by selecting **Yes**.
+7. **Add a label** of "Segment" to your API key so you can track where this API key is used.
+8. Select **Show** in the **Private Key** column to reveal your private key.
+9. Copy this private key and paste it into the **Secret Key** field in the Postscript destination settings in Segment.
+10. After completing the setup, configure the 'Sync Audiences' Action in your destination settings to begin syncing Audience data to Postscript.
+
+{% include components/actions-fields.html %}