title: HttpClient not available Shared Library project Xamarin
body: <p>I come to you for a common problem, but unfortunately, I was unable to find a solution.</p>
  
  <p>I make a xamarin.form application, it is not a PCL, but a Shared Library project. I would like to use a REST api, and for this, I need to use a HttpClient instance. 
  Well, here is the problem. With a PCL, I just have to add the nuget package Microsoft HTTP Client Libraries, and then I can use the HttpClient class.</p>
  
  <p>With a Shared Library project, I cannot add this nuget package to the main project (which I think is normal). So I it add to to the .Droid one, and the .iOS one (oh, by the way, I am using a mac, and Xamarin Studio, if it can help).
  When I add the Nuget package, I can add this line : using System.Net.Http; but the class HttpClient is still unavailable. What I mean by unavailable is, I just cannot use this class (The type or namespace httpclient could not be found, are you missing an assembly reference ? )</p>
  
  <p>Is there a way to use HttpClient class in a Shared Project, and not a PCL ? If yes, how ?</p>