✨ Add Microsoft SQL node docs

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

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+---
+permalink: /nodes/n8n-nodes-base.microsoftSql
+---
+
+# Microsoft SQL
+
+[Microsoft SQL](https://www.microsoft.com/en-us/sql-server) is a relational database management system. As a database server, it is a software product with the primary function of storing and retrieving data as requested by other software applications—which may run either on the same computer or on another computer across a network.
+
+::: tip 🔑 Credentials
+You can find authentication information for this node [here](../../../credentials/MicrosoftSQL/README.md).
+:::
+
+## Basic Operations
+
+- Execute an SQL query
+- Insert rows in database
+- Update rows in database
+- Delete rows in database
+
+
+## Example Usage
+
+This workflow allows you to execute an SQL query in Microsoft SQL. You can also find the [workflow](https://n8n.io/workflows/479) on the website. This example usage workflow would use the following two nodes.
+- [Start](../../core-nodes/Start/README.md)
+- [Microsoft SQL]()
+
+The final workflow should look like the following image.
+
+![A workflow with the Microsoft SQL node](./workflow.png)
+
+### 1. Start node
+
+The start node exists by default when you create a new workflow.
+
+### 2. Microsoft SQL node
+
+1. First of all, you'll have to enter credentials for the Microsoft SQL node. You can find out how to do that [here](../../../credentials/MicrosoftSQL/README.md).
+2. Select 'Execute Query' from the *Operation* dropdown list.
+3. Enter your SQL query in the *Query* field.
+4. Click on *Execute Node* to run the workflow.