I've added IdentityServer4 NuGet package to ASP.NET core project using dotnet cli. Then written the following code on `Startup` class.

```
public void ConfigureServices(IServiceCollection services)
    {           
        services.AddIdentityServer()
            .AddInMemoryClients(new Client[] 
                { 
                    new Client
                    { 
                        ClientId = "react client", 
                        ClientName = "React Client",
                        AllowedGrantTypes = GrantTypes.Implicit,
                        RedirectUrls = {"http://localhost:51009/"},
                        AllowedScopes = { "openid"}
                    }
                });            
        services.AddMvc();
    }

```

Then when I build the project it shows error: `The type or namespace name 'Client' could not be found (are you missing a using directive or an assembly reference?)`

Moreover VS Code doesn't show any suggestion for IdentityServer related code.

And when I search IdentityServer4 on NuGet website it shows result like following:
[![Search result on NuGet website](https://i.stack.imgur.com/1ycTk.jpg)](https://i.stack.imgur.com/1ycTk.jpg)

And when I search IdentityServer4 on Visual Studio 2017 it shows result like following:
[![Search result on Visual Studio 2017](https://i.stack.imgur.com/WKLS1.jpg)](https://i.stack.imgur.com/WKLS1.jpg)