Provide Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore package README (dotnet#57807)

Author: MackinnonBuck

src/Middleware/HealthChecks.EntityFrameworkCore/src/PACKAGE.md

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+## About
+
+`Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore` provides components for performing health checks using Entity Framework Core (EF Core).
+
+## How to Use
+
+To use `Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore`, follow these steps:
+
+### Installation
+
+```shell
+dotnet add package Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore
+```
+
+### Configuration
+
+To add a health check for an EF Core `DbContext`, use the `AddDbContextCheck` extension method to configure it with your app's service provider. Here's an example:
+
+```csharp
+builder.Services.AddDbContext<SampleDbContext>(options =>
+    options.UseSqlServer(builder.Configuration.GetConnectionString("DefaultConnection")));
+
+builder.Services.AddHealthChecks()
+    .AddDbContextCheck<SampleDbContext>();
+```
+
+## Additional Documentation
+
+For additional documentation and examples, refer to the [official documentation](https://learn.microsoft.com/aspnet/core/host-and-deploy/health-checks#entity-framework-core-dbcontext-probe) on using the Entity Framework Core `DbContext` probe.
+
+## Feedback &amp; Contributing
+
+`Microsoft.Extensions.Diagnostics.HealthChecks.EntityFrameworkCore` is released as open-source under the [MIT license](https://licenses.nuget.org/MIT). Bug reports and contributions are welcome at [the GitHub repository](https://github.com/dotnet/aspnetcore).