docs: Add Microsoft SQL Server example

docs/modules/microsoft-sql-server.md

@@ -0,0 +1,57 @@
+# Microsoft SQL Server
+
+[Microsoft SQL Server](https://www.microsoft.com/en-us/sql-server), also known as MSSQL, is a relational database engine developed by Microsoft and is a popular choice in enterprise systems. The following example provides .NET developers with a starting point to use a Microsoft SQL Server instance in the [xUnit][xunit] tests.
+
+The following example uses the following NuGet packages:
+
+```console title="Install the NuGet dependencies"
+dotnet add package Testcontainers.MsSql
+dotnet add package Microsoft.Data.SqlClient
+dotnet add package xunit
+```
+
+IDEs and editors may also require the following packages to run tests: `xunit.runner.visualstudio` and `Microsoft.NET.Test.Sdk`.
+
+Copy and paste the following code into a new `.cs` test file within an existing test project.
+
+```csharp
+using Microsoft.Data.SqlClient;
+using Testcontainers.MsSql;
+using Xunit;
+
+namespace TestcontainersModules;
+
+public class MsSqlServerContainerTest : IAsyncLifetime
+{
+    private readonly MsSqlContainer msSqlContainer
+        = new MsSqlBuilder()
+            .Build();
+
+    [Fact]
+    public async Task ReadFromMsSqlDatabase()
+    {
+        await using var connection = new SqlConnection(msSqlContainer.GetConnectionString());
+        await connection.OpenAsync();
+
+        await using var command = connection.CreateCommand();
+        command.CommandText = "Select 1;";
+
+        var actual = await command.ExecuteScalarAsync() as int?;
+        Assert.Equal(expected: 1, actual: actual.GetValueOrDefault());
+    }
+
+    public Task InitializeAsync()
+        => msSqlContainer.StartAsync();
+
+    public Task DisposeAsync()
+        => msSqlContainer.DisposeAsync().AsTask();
+}
+```
+
+To execute the tests, use the command `dotnet test` from a terminal.
+
+## A Note To Developers
+
+Once Testcontainers creates a server instance, developers may use the connection string with any of the popular data-access technologies found in the .NET Ecosystem. Some of these libraries include [Entity Framework Core](https://www.nuget.org/packages/Microsoft.EntityFrameworkCore), [Dapper](https://www.nuget.org/packages/Dapper), and [NHibernate](https://www.nuget.org/packages/NHibernate). At which point, developers can execute database migrations and SQL scripts.
+
+[xunit]: https://xunit.net/