Enhance SQL tutorial with introduction and objectives

Added introduction section to SQL database tutorial.

Author: wadepickett

aspnetcore/tutorials/first-mvc-app/working-with-sql/includes/working-with-sql3-5.md

@@ -1,9 +1,25 @@
 :::moniker range=">= aspnetcore-3.1 < aspnetcore-6.0"
 
+## Introduction
+
+This part of the tutorial series focuses on working with a SQL database in your ASP.NET Core MVC application.
+
+You’ll learn how to:
+
+- Connect your application to a SQL database
+- Map models to database records
+- Configure the Entity Framework Core context
+- Perform CRUD (Create, Read, Update, Delete) operations
+
+By the end of this guide, you’ll understand the basics of working with databases in ASP.NET Core using Entity Framework Core.
+
 ## Prerequisite
 
 This tutorial uses a database you set up in the previous step: <xref:tutorials/first-mvc-app/adding-model>.
 
+## Working with the database context
+
+
 The `MvcMovieContext` object handles the task of connecting to the database and mapping `Movie` objects to database records. The database context is registered with the [Dependency Injection](xref:fundamentals/dependency-injection) container in the `ConfigureServices` method in the `Startup.cs` file:
 
 # [Visual Studio](#tab/visual-studio)