Update README.md

Author: damienbod

README.md

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 # An ASP.NET Core IdentityServer4 Identity Template with Bootstrap 4 and Localization
 
-[![Build status](https://ci.appveyor.com/api/projects/status/ibm36ev49bpjf3o9?svg=true)](https://ci.appveyor.com/project/damienbod/identityserver4aspnetcoreidentitytemplate) [![NuGet Status](http://img.shields.io/nuget/v/IdentityServer4AspNetCoreIdentityTemplate.svg?style=flat-square)](https://www.nuget.org/packages/IdentityServer4AspNetCoreIdentityTemplate/) [Change log](https://github.com/damienbod/IdentityServer4AspNetCoreIdentityTemplate/blob/master/Changelog.md)
+[![.NET](https://github.com/damienbod/IdentityServer4AspNetCoreIdentityTemplate/actions/workflows/dotnet.yml/badge.svg)](https://github.com/damienbod/IdentityServer4AspNetCoreIdentityTemplate/actions/workflows/dotnet.yml)
+
+[![NuGet Status](http://img.shields.io/nuget/v/IdentityServer4AspNetCoreIdentityTemplate.svg?style=flat-square)](https://www.nuget.org/packages/IdentityServer4AspNetCoreIdentityTemplate/) [Change log](https://github.com/damienbod/IdentityServer4AspNetCoreIdentityTemplate/blob/master/Changelog.md)
 
 ## Features