SwaggerStartup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddMvc();
    services.AddSwaggerGen(c =>
    {
        c.SwaggerDoc("v1", new Info
        {
            Version = "v1",
            Title = "My API",
            Description = "My First ASP.NET Core Web API",
            TermsOfService = "None",
            Contact = new Contact() { Name = "Talking Dotnet", Email = "[email protected]", Url = "www.talkingdotnet.com" }
        });
    });
}