✨ Add Write Binary File node docs

docs/nodes/nodes-library/core-nodes/WriteBinaryFile/README.md

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+---
+permalink: /nodes/n8n-nodes-base.writeBinaryFile
+---
+
+# Write Binary File
+
+The Write Binary File node is used to write a file to the host machine that runs n8n.
+
+::: tip 💡 Keep in mind
+1. If you are running n8n in Docker, your command will run on the n8n container and not the Docker host.
+2. This node will look for files relative to the n8n install path. It is recommended to use absolute file paths to prevent any errors.
+:::
+
+## Node Reference
+
+1. ***File Name*** field: This field specifies the path to which the file should be written, along with the file name.
+2. ***Property Name*** field: Name of the binary property to which to write the data of the read file.
+
+## Example Usage
+
+This workflow allows you to write a file to the host machine using the Write Binary File node. You can also find the [workflow](https://n8n.io/workflows/590) on the website. This example usage workflow would use the following nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [HTTP Request](../../core-nodes/HTTPRequest/README.md)
+- [Write Binary File]()
+
+
+The final workflow should look like the following image.
+
+![A workflow with the Write Binary File 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 file in the ***URL*** field. For example, `https://docs.n8n.io/assets/img/n8n-logo.png`.
+2. Select the 'File' option from the ***Response Format*** dropdown list. 
+3. Click on ***Execute Node*** to run the node.
+
+![Using the HTTP Request node to get an image](./HTTPRequest_node.png)
+
+
+### 3. Write Binary File node
+
+1. Enter the path to which the file should be written along with the file name in the ***File Name*** field.
+2. Click on ***Execute Node*** to run the node.