added testproject for importing mqtt nugets and verify bin folder

Tests/MQTTnet.Test.NugetConsumption/MQTTnet.Test.NugetConsumption.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFrameworks>netcoreapp2.0;net452;net461</TargetFrameworks>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="MQTTnet" Version="2.5.2" />
+  </ItemGroup>
+
+</Project>

Tests/MQTTnet.Test.NugetConsumption/Program.cs

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+using System;
+
+namespace MQTTnet.Test.NugetConsumption
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            var server = new MqttFactory().CreateMqttServer();
+        }
+    }
+}

Tests/MQTTnet.Test.NugetConsumption/nuget.config

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+<configuration>
+  <!--
+        Used to specify the default Sources for list, install and update.
+        See: nuget.exe help list
+        See: nuget.exe help install
+        See: nuget.exe help update
+    -->
+  <packageSources>
+    <add key="NuGet official package source" value="https://nuget.org/api/v2/" />
+    <add key="local" value="/../../Build/NuGet" />
+  </packageSources>
+
+  <!-- Used to disable package sources  -->
+  <disabledPackageSources />
+</configuration>