✨ Add documentation for the Line node

docs/nodes/credentials/Line/README.md

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+---
+permalink: /credentials/line
+description: Learn to configure credentials for the Line node in n8n
+---
+
+# Line
+
+You can use these credentials to authenticate the following nodes with Line.
+- [Line](../../nodes-library/nodes/Line/README.md)
+
+## Prerequisites
+
+Create a [Line](https://line.me/en/) account.
+
+## Using OAuth
+
+1. Access the [LINE Notify](https://notify-bot.line.me/en/) page.
+2. Click on your name on the top right corner and select 'Manage registered services' from the dropdown list.
+3. Click on the ***Add service*** button.
+4. Enter all the necessary information.
+5. Copy your OAuth Callback URL from the 'Create New Credentials' screen in n8n and paste it in the ***Callback URL*** field.
+6. Click on the ***Agree and continue*** button.
+7. Click on the ***Add*** button.
+8. Check your inbox for the verification email.
+9. Click on the link under the ***LINE Notify Registration URL*** in your email.
+10. On the LINE Notify page, click on the ***My services*** button.
+11. Click on the new service you created.
+12. Use the provided ***Client ID*** and ***Client Secret*** with your Line Notify OAuth2 API credentials in n8n.
+13. Click on the circle button in the OAuth section to connect a Line account to n8n.
+14. Click the ***Save*** button to save your credentials in n8n.
+
+![Getting Line credentials](./using-oauth.gif)

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

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+---
+permalink: /nodes/n8n-nodes-base.line
+description: Learn how to use the Line node in n8n
+---
+
+# Line
+
+[Line](https://line.me/en/) is a mobile messenger app that allows you to make free voice calls and send messages.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/Line/README.md).
+:::
+
+## Basic Operations
+
+::: details Notification
+- Send
+:::
+
+## Example Usage
+
+This workflow allows you to send daily weather updates via a notification using the Line node. You can also find the [workflow](https://n8n.io/workflows/773) on n8n.io. This example usage workflow uses the following nodes.
+- [Cron](../../core-nodes/Cron/README.md)
+- [OpenWeatherMap](../../nodes/OpenWeatherMap/README.md)
+- [Line]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Line node](./workflow.png)
+
+### 1. Cron node
+
+The Cron node will trigger the workflow daily at 9 AM.
+
+1. Click on ***Add Cron Time***.
+2. Set hours to 9 in the ***Hour*** field.
+3. Click on ***Execute Node*** to run the node.
+
+In the screenshot below, you will notice that the Cron node is configured to trigger the workflow every day at 9 AM.
+
+![Using the Cron node to trigger the workflow daily at 9 am](./Cron_node.png)
+
+### 2. OpenWeatherMap node (Current Weather)
+
+This node will return data about the current weather in Berlin. To get the weather updates for your city, you can enter the name of your city instead.
+
+1. First of all, you'll have to enter credentials for the OpenWeatherMap node. You can find out how to do that [here](../../../credentials/OpenWeatherMap/README.md). 
+2. Enter `berlin` in the ***City*** field.
+3. Click on ***Execute Node*** to run the node.
+
+In the screenshot below, you will notice that the node returns data about the current weather in Berlin.
+
+![Using the OpenWeatherMap node to get weather updates for Berlin](./OpenWeatherMap_node.png)
+
+### 3. Line node (send: notification)
+
+This node will send a notification with the weather update. 
+
+1. First of all, you'll have to enter credentials for the Line node. You can find out how to do that [here](../../../credentials/Line/README.md).
+2. Click on the gears icon next to the ***Message*** field and click on ***Add Expression***.
+::: v-pre
+3. Enter the following message in the ***Expression*** field: `Hey! The temperature outside is {{$node["OpenWeatherMap"].json["main"]["temp"]}}°C.`.
+4. Click on ***Execute Node*** to run the node.
+:::
+
+In the screenshot below, you will notice that the node sends a notification with the weather update.
+
+![Using the Line node to send weather updates via a notification](./Line_node.png)