✨ Add LinkedIn node docs

docs/nodes/nodes-library/nodes/LinkedIn/README.md

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+---
+permalink: /nodes/n8n-nodes-base.linkedIn
+---
+
+# LinkedIn
+
+[LinkedIn](https://www.linkedin.com/) is an employment-oriented online service. It is mainly used for professional networking, including employers posting jobs and job seekers posting their CVs.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/LinkedIn/README.md).
+:::
+
+## Basic Operations
+
+- Post
+    - Create a new post
+
+## Example Usage
+
+This workflow allows you to download an image and post it on LinkedIn. You can also find the [workflow](https://n8n.io/workflows/681) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [HTTP Request](../../core-nodes/HTTPRequest/README.md)
+- [LinkedIn]
+
+The final workflow should look like the following image.
+
+![A workflow with the LinkedIn node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. HTTP Request node
+
+1. Enter the URL of the image you want to download in the ***URL*** field.
+2. Select ***File*** from the ***Response Format*** dropdown list.
+3. Click on ***Execute Node*** to run the node.
+
+![Downloading an image with the HTTP Request node](./HTTPRequest_node.png)
+
+### 3. LinkedIn node
+
+1. First of all, you'll have to enter credentials for the LinkedIn node. You can find out how to do that [here](../../../credentials/LinkedIn/README.md).
+2. Select 'Person' from the ***Post As*** dropdown list.
+3. Select the person you want to post as from the ***Person*** dropdown list.
+4. Enter a message in the ***Text*** field.
+5. Select 'Image' from the ***Media Category*** dropdown list.
+6. Click on ***Execute Node*** to run the node.
+
+![Posting with the LinkedIn node](./LinkedIn_node.png)