docs: Readded Extensions.UnitTests to readme

Author: jhartmann123

README.md

@@ -39,8 +39,8 @@ Provides services and extensions for hosting. See the [documentation](docs/Hosti
 [![NuGet](https://img.shields.io/nuget/v/Fusonic.Extensions.Mediator.svg?label=Fusonic.Extensions.Mediator&style=plastic)](https://www.nuget.org/packages/Fusonic.Extensions.Mediator/)
 Provides simple mediator implementation. See the [documentation](docs/Mediator/README.md) for more details.
 
-[![NuGet](https://img.shields.io/nuget/v/Fusonic.Extensions.TestContainers.svg?label=Fusonic.Extensions.TestContainers&style=plastic)](https://www.nuget.org/packages/Fusonic.Extensions.TestContainers/)
-Provides simple mediator implementation. See the [documentation](docs/Mediator/README.md) for more details.
+[![NuGet](https://img.shields.io/nuget/v/Fusonic.Extensions.UnitTests.svg?label=Fusonic.Extensions.UnitTests&style=plastic)](https://www.nuget.org/packages/Fusonic.Extensions.UnitTests/)
+Xunit v3 based testing base classes with support for dependency injection. Supports DI containers SimpleInjector and ServiceProvider. See the [unit test documentation](docs/UnitTests/README.md) for more details.
 
 [![NuGet](https://img.shields.io/nuget/v/Fusonic.Extensions.UnitTests.EntityFrameworkCore.svg?label=Fusonic.Extensions.UnitTests.EntityFrameworkCore&style=plastic)](https://www.nuget.org/packages/Fusonic.Extensions.UnitTests.EntityFrameworkCore/)
 Adds database support using EF Core to the unit tests. See the [unit test documentation](docs/UnitTests/README.md) for more details.
@@ -111,4 +111,4 @@ Integration Workflow
 3. Notify Fusonic Extensions "Design member board" (David Roth, Johannes Hartmann)
 4. Discussion in GL Issue or Mr Request or Design Meeting
 5. New APIs require the approval of at least one board member
-6. New APIs should be communicated (announcement)
+6. New APIs should be communicated (announcement)