✨ Add OpenWeatherMap node docs

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

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+---
+permalink: /nodes/n8n-nodes-base.openWeatherMap
+---
+
+# OpenWeatherMap
+
+[OpenWeatherMap](https://openweathermap.org/) is an online service that provides weather data. It provides current weather data, forecasts, and historical data. 
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/OpenWeatherMap/README.md).
+:::
+
+## Basic Operations
+
+- Returns the current weather data
+- Returns the weather data for the next 5 days
+
+## Example Usage
+
+This workflow allows you to get the current weather data for a city. You can also find the [workflow](https://n8n.io/workflows/460) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [OpenWeatherMap]()
+
+The final workflow should look like the following image.
+
+![A workflow with the OpenWeatherMap node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. OpenWeatherMap node
+
+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 the name of the city in the *City* field.
+3. Click on *Execute Node* to run the workflow.
+
+
+## Further Reading
+
+- [Creating Telegram Bots with n8n, a No-Code Platform](https://medium.com/n8n-io/creating-telegram-bots-with-n8n-a-no-code-platform-fdf1f0928da7)