Added MongoDB docs + Updated Facebook Credentials (#35)

* Added CircleCI credentials

* Added MessageBird credentials

* Added OpenWeatherMap credentials

* Added Zoom Credentials

* 🐛 Updated Facebook Graph API Credentials

* ✨ Added MongoDB docs

* 🐛 Updated MongoDB node

* 🐛 Updated facebook credential docs

* 🐛 Add link for Set node in mongodb docs

docs/nodes/credentials/Facebook/README.md

@@ -8,12 +8,12 @@ Create a [Facebook](https://www.facebook.com/) account.
 
 ## Using Access Token
 
-1. Access [Facebook for Developers portal](https://developers.facebook.com/
-).
+1. Access [Facebook for Developers portal](https://developers.facebook.com/).
 2. Click on "My Apps".
-3. Access your app.
-4. Click Settings, Advanced.
-5. Scroll down and note Client Token.
-6. Use provided access token with your Facebook node credentials in n8n.
+3. Access your app. Create an app if you don't already have one.
+4. Access the [Facebook Graph API Explorer](https://developers.facebook.com/tools/explorer/).
+5. Select your app under the *Facebook App* dropdown list on the right sidebar.
+6. Click on the 'Generate Access Token' button and login with your facebook account.
+6. Use generated access token with your Facebook node credentials in n8n.
 
 ![Getting Facebook credentials](./using-access-token.gif)

docs/nodes/credentials/MongoDB/README.md

@@ -0,0 +1,12 @@
+# MongoDB
+
+You can find information about the operations supported by the MongoDB node on the [integrations](https://n8n.io/integrations/n8n-nodes-base.mongoDb) page. You can also browse the source code of the node on [GitHub](https://github.com/n8n-io/n8n/tree/master/packages/nodes-base/nodes/MongoDb).
+
+## Prerequisites
+
+Create an user account with the appropriate permissions on a MongoDB server.
+
+## Using Access Token
+
+1. Retrieve your MongoDB credentials and connection parameters.
+2. Use the credentials and connection parameters with your MongoDB node credentials in n8n.

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

@@ -0,0 +1,48 @@
+---
+permalink: /nodes/n8n-nodes-base.mongoDb
+---
+
+# MongoDB
+
+[MongoDB](https://www.mongodb.com/) is a cross-platform document-oriented database program developed by MongoDB Inc. It is classified as a NoSQL database program. MongoDB uses JSON-like documents with optional schemas. 
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/MongoDB/README.md).
+:::
+
+## Basic Operations
+
+- Insert documents
+- Find documents
+- Delete documents
+- Update documents
+
+
+## Example Usage
+
+This workflow allows you to insert a document into a MongoDB collection. You can also find the [workflow](https://n8n.io/workflows/503) on the website. This example usage workflow would use the following three nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Set](../../core-nodes/Set/README.md)
+- [MongoDB]()
+
+The final workflow should look like the following image.
+
+![A workflow with the MongoDB node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Set node
+
+1. Click on the *Add Value* button and select 'String' from the dropdown list.
+2. Enter `my_key`in the *Name* field.
+3. Enter `my_value` in the *Value* field.
+
+### 3. MongoDB node
+
+1. First of all, you'll have to enter credentials for the MongoDB node. You can find out how to do that [here](../../../credentials/MongoDB/README.md).
+2. Select 'Insert' from the *Operation* dropdown list.
+3. Enter the name of your MongoDB collection in the *Collection* field.
+4. Enter `my_key` in the *Fields* field.
+5. Click on *Execute Node* to run the workflow.