Add Postscript Destination doc

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

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+---
+title: Postscript Destination
+---
+
+{% 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 destination is maintained by Postscript. For any issues with the destination, [contact their Support team](mailto:[email protected]).
+
+## 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 <YOURINTEGRATION> 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.
+
+{% include components/actions-fields.html %}