Update README.md

Author: kapi2289

README.md

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 # Inertia.js ASP.NET Adapter
 
 [![NuGet](https://img.shields.io/nuget/v/AspNetCore.InertiaCore?style=flat-square&color=blue)](https://www.nuget.org/packages/AspNetCore.InertiaCore)
+[![Build](https://img.shields.io/github/actions/workflow/status/kapi2289/InertiaCore/dotnet.yml?style=flat-square)](https://github.com/kapi2289/InertiaCore/actions)
 [![NuGet](https://img.shields.io/nuget/dt/AspNetCore.InertiaCore?style=flat-square)](https://www.nuget.org/packages/AspNetCore.InertiaCore)
 [![License](https://img.shields.io/github/license/kapi2289/InertiaCore?style=flat-square)](https://github.com/kapi2289/InertiaCore/blob/main/LICENSE)