✨ Added Facebook Graph API docs

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

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+---
+permalink: /nodes/n8n-nodes-base.facebookGraphApi
+---
+
+# Facebook
+
+[Facebook](https://www.facebook.com/) is an American online social media and social networking service based in Menlo Park, California.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/Facebook/README.md).
+:::
+
+## Basic Operations
+
+- Default
+	- GET
+	- POST
+	- DELETE
+- Video Uploads
+	- GET
+	- POST
+	- DELETE
+
+
+## Example Usage
+
+This workflow allows you to retrieve the first and last name of a profile on Facebook. You can also find the [workflow](https://n8n.io/workflows/514) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Facebook Graph API]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Facebook Graph API node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Facebook Graph API node
+
+1. First of all, you'll have to enter credentials for the Facebook Graph API node. You can find out how to do that [here](../../../credentials/Facebook/README.md).
+2. Enter 'me' in the *Node* field.
+3. Click on the *Add Option* dropdown and select 'Fields' from the list.
+4. Click on the *Add Field* button and add `first_name` and `last_name` as fields.
+5. Click on *Execute Node* to run the workflow.