Provide Microsoft.AspNetCore.Diagnostics.EntityFramework package README (#57540)

Author: MackinnonBuck

src/Middleware/Diagnostics.EntityFrameworkCore/src/PACKAGE.md

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+## About
+
+`Microsoft.AspNetCore.Diagnostics.EntityFramework` provides an ASP.NET Core middleware for EF Core error pages, allowing detection and diagnosis of errors with EF Core migrations.
+
+## Key Features
+
+* Captures and displays detailed error information from Entity Framework Core database operations
+* Helps developers diagnose and troubleshoot database-related issues in ASP.NET Core applications
+
+## How to Use
+
+To use `Microsoft.AspNetCore.Diagnostics.EntityFramework`, follow these steps:
+
+### Installation
+
+```shell
+dotnet add package Microsoft.AspNetCore.Diagnostics.EntityFramework
+```
+
+### Configuration
+
+To use the middleware, add it to the ASP.NET Core pipeline defined in your app's `Program.cs`:
+
+```csharp
+builder.Services.AddDatabaseDeveloperPageExceptionFilter();
+
+var app = builder.build();
+
+if (app.Environment.IsDevelopment())
+{
+    app.UseDeveloperExceptionPage();
+    app.UseMigrationsEndPoint();
+}
+```
+
+## Additional Documentation
+
+For more information on using Entity Framework Core in ASP.NET Core applications, refer to the [official documentation](https://learn.microsoft.com/aspnet/core/data/ef-rp/intro).
+
+## Feedback & Contributing
+
+`Microsoft.AspNetCore.Diagnostics.EntityFramework` 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).