title: IServiceCollection Does not contain definition AddJsEngineSwitcher
body: <p>Trying to build ReactJS.NET in Visual Studio 2015</p>
  
  <pre><code>using Microsoft.AspNetCore.Http;
  using JavaScriptEngineSwitcher.Core;
  using JavaScriptEngineSwitcher.ChakraCore;
  using React.AspNet;
  </code></pre>
  
  <p>In <code>ConfigureServices</code></p>
  
  <pre><code>public void ConfigureServices(IServiceCollection services)
  {
      // Add framework services.
      services.AddApplicationInsightsTelemetry(Configuration);
  
      services.AddSingleton&lt;IHttpContextAccessor, HttpContextAccessor&gt;();
      services.AddReact();
  
      services.AddJsEngineSwitcher(options =&gt; options.DefaultEngineName = ChakraCoreJsEngine.EngineName)
          .AddChakraCore();
  
       services.AddMvc();
  }
  </code></pre>
  
  <p>Got an Error to this part:</p>
  
  <p><code>AddJsEngineSwitcher</code></p>
  
  <blockquote>
    <p>IServiceCollection does not contain definition for AddJsEngineSwitcher</p>
  </blockquote>
  
  <p>Trying to fix some solutions but got no luck.</p>
  
  <p>Checking also my Reference </p>
  
  <p><code>JavaScriptEngineSwitcher 3.0.0</code> is exists.</p>
  
  <p>Also searching in Nuget package and changed <code>JavaScriptEngineSwitcher</code> but still the same.  </p>
  
  <p>I am using .NET Framework 4.6.</p>