✨Add documentation for Google Cloud Firestore node

docs/nodes/credentials/Google/README.md

@@ -10,6 +10,7 @@ You can use these credentials to authenticate the following nodes with Google.
 - [Gmail](../../nodes-library/nodes/Gmail/README.md)
 - [Google Books](../../nodes-library/nodes/GoogleBooks/README.md)
 - [Google Calendar](../../nodes-library/nodes/GoogleCalendar/README.md)
+- [Google Cloud Firestore](../../nodes-library/nodes/GoogleCloudFirestore/README.md)
 - [Google Cloud Natural Language](../../nodes-library/nodes/GoogleCloudNaturalLanguage/README.md)
 - [Google Drive](../../nodes-library/nodes/GoogleDrive/README.md)
 - [Google Sheets](../../nodes-library/nodes/GoogleSheets/README.md)

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

@@ -0,0 +1,129 @@
+---
+permalink: /nodes/n8n-nodes-base.googleFirebaseCloudFirestore
+description: Learn how to use the Google Cloud Firestore node in n8n
+---
+
+# Google Cloud Firestore
+
+[Google Cloud Firestore](https://firebase.google.com/docs/firestore/) is a flexible, scalable database for mobile, web, and server development from Firebase and Google Cloud. It keeps your data in-sync across client apps through real-time listeners and offers offline support for mobile and web.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/Google/README.md).
+:::
+
+## Basic Operations
+
+:::details Document
+- Create a document
+- Create/Update a document
+- Delete a document
+- Get a document
+- Get all documents from a collection
+:::
+
+:::details Collection
+- Get all root collections
+:::
+
+## Example Usage
+
+This workflow allows you to create, update, and get a document in the Google Cloud Firestore. You can also find the [workflow](https://n8n.io/workflows/839) on n8n.io. This example usage workflow uses the following nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Set](../../core-nodes/Set/README.md)
+- [Google Cloud Firestore]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Google Cloud Firestore node](./workflow.png)
+
+### 1. Start node
+
+The Start node exists by default when you create a new workflow.
+
+### 2. Set node
+
+We will use the Set node to set the name and id.
+
+1. Click on ***Add Value*** and select 'String' from the dropdown list.
+2. Enter `name` in the ***Name*** field.
+3. Enter `n8n` in the ***Value*** field.
+4. Click on ***Add Value*** and select 'Number' from the dropdown list.
+5. Enter `id` in the ***Name*** field.
+6. Enter `1` in the ***Value*** field.
+7. Click on ***Execute Node*** to run the node.
+
+In the screenshot below, you will notice that node sets the value for name and id.
+
+![Using the Set node to set the data](./Set_node.png)
+
+### 3. Google Cloud Firestore node (document: create)
+
+This node will create a new document in a collection in Google Cloud Firestore with the data from the previous node.
+
+1. First of all, you'll have to enter credentials for the Google Cloud Firestore node. You can find out how to do that [here](../../../credentials/Google/README.md).
+2. Select 'Create' from the ***Operation*** dropdown list.
+3. Select a project from the ***Project ID*** dropdown list.
+4. Enter the name of your collection in the ***Collection*** field.
+5. Enter `id, name` in the ***Columns / attributes*** field.
+6. Click on ***Execute Node*** to run the node.
+
+In the screenshot below, you will notice that the node creates a new document using the data from the previous node.
+
+![Using the Google Cloud Firestore node to create new document](./GoogleCloudFirestore_node.png)
+
+### 4. Set node
+
+We will use the Set node to ensure that only the data that we set in this node gets passed on to the next nodes in the workflow. We will set a new value for `name`.
+::: v-pre
+1. Click on ***Add Value*** and select 'String' from the dropdown list.
+2. Enter `name` in the ***Name*** field.
+3. Enter `nodemation` in the ***Value*** field.
+4. Click on ***Add Value*** and select 'String' from the dropdown list.
+5. Enter `document_id` in the ***Name*** field.
+6. Click on the gears icon next to the ***Value*** field and click on ***Add Expression***.
+7. Select the following in the ***Variable Selector*** section: Nodes > Google Cloud Firestore > Output Data > JSON > _id. You can also add the following expression: `{{$node["Google Cloud Firestore"].json["_id"]}}`.
+8. Toggle ***Keep Only Set*** to `true`. We set this option to true to ensure that only the data that we have set in this node get passed on to the next nodes in the workflow.
+9. Click on ***Execute Node*** to run the node.
+:::
+
+In the screenshot below, you will notice that the node sets the values of `name` and `document_id`. These values are passed to the next node in the workflow.
+
+![Using the Set node to set the values for name and document_id](./Set1_node.png)
+
+### 5. Google Cloud Firestore1 node (document: upsert)
+
+This node will update the value of the `name` field in the document that we created using the Google Cloud Firestore node.
+::: v-pre
+1. Select the credentials that you entered in the previous Google Cloud Firestore node.
+2. Select 'Create/Update' from the ***Operation*** dropdown list.
+3. Click on the gears icon next to the ***Project ID*** field and click on ***Add Expression***.
+4. Select the following in the ***Variable Selector*** section: Nodes > Google Cloud Firestore > Parameters > projectId. You can also add the following expression: `{{$node["Google Cloud Firestore"].parameter["projectId"]}}`.
+5. Click on the gears icon next to the ***Collection*** field and click on ***Add Expression***.
+6. Select the following in the ***Variable Selector*** section: Nodes > Google Cloud Firestore > Parameters > collection. You can also add the following expression: `{{$node["Google Cloud Firestore"].parameter["collection"]}}`.
+7. Enter `document_id` in the ***Update Key*** field.
+8. Enter `name` in the ***Column /Attributes*** field.
+9. Click on ***Execute Node*** to run the node.
+:::
+
+In the screenshot below, you will notice that the node updates the value of the `name` field in the document that we created using the Google Cloud Firestore node.
+
+![Using the Google Cloud Firestore node to update a document](./GoogleCloudFirestore1_node.png)
+
+### 6. Google Cloud Firestore node (document: get)
+
+This node will get the document that we created using the Google Cloud Firestore node.
+
+::: v-pre
+1. Select the credentials that you entered in the previous node.
+2. Click on the gears icon next to the ***Project ID*** field and click on ***Add Expression***.
+3. Select the following in the ***Variable Selector*** section: Nodes > Google Cloud Firestore > Parameters > projectId. You can also add the following expression: `{{$node["Google Cloud Firestore"].parameter["projectId"]}}`.
+4. Click on the gears icon next to the ***Collection*** field and click on ***Add Expression***.
+5. Select the following in the ***Variable Selector*** section: Nodes > Google Cloud Firestore > Parameters > collection. You can also add the following expression: `{{$node["Google Cloud Firestore"].parameter["collection"]}}`.
+6. Click on the gears icon next to the ***Document ID*** field and click on ***Add Expression***.
+7. Select the following in the ***Variable Selector*** section: Nodes > Set1 > Output Data > JSON > document_id. You can also add the following expression: `{{$node["Set1"].json["document_id"]}}`.
+8. Click on ***Execute Node*** to run the node.
+:::
+
+In the screenshot below, you will notice that the node returns the document that we created using the Google Cloud Firestore node.
+
+![Using the Google Cloud Firestore node to get a document](./GoogleCloudFirestore2_node.png)