✨ Add Pipedrive Trigger node docs

docs/nodes/nodes-library/trigger-nodes/PipedriveTrigger/README.md

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+---
+permalink: /nodes/n8n-nodes-base.pipedriveTrigger
+---
+
+# Pipedrive Trigger
+
+[Pipedrive](https://www.pipedrive.com/) is a cloud-based sales software company that aims to improve the productivity of businesses through the use of their software.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/Pipedrive/README.md).
+:::
+
+
+## Example Usage
+
+This workflow allows you to receive updates for all changes in Pipedrive. You can also find the [workflow](https://n8n.io/workflows/490) on the website. This example usage workflow would use the following node.
+- [Pipedrive Trigger]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Pipedrive Trigger node](./workflow.png)
+
+
+### 1. Pipedrive Trigger node
+
+1. First of all, you'll have to enter credentials for the Pipedrive Trigger node. You can find out how to do that [here](../../../credentials/Pipedrive/README.md).
+2. Click on *Execute Node* to run the workflow.