Add PlatformNotSupportedException exception (#174)

***NO_CI***

Author: josesimoes

nanoFramework.CoreLibrary.NoReflection/CoreLibrary.NoReflection.nfproj

@@ -137,6 +137,9 @@
     <Compile Include="..\nanoFramework.CoreLibrary\System\ObsoleteAttribute.cs" Link="System\ObsoleteAttribute.cs" />
     <Compile Include="..\nanoFramework.CoreLibrary\System\OutOfMemoryException.cs" Link="System\OutOfMemoryException.cs" />
     <Compile Include="..\nanoFramework.CoreLibrary\System\ParamArrayAttribute.cs" Link="System\ParamArrayAttribute.cs" />
+    <Compile Include="..\nanoFramework.CoreLibrary\System\PlatformNotSupportedException.cs">
+      <Link>System\PlatformNotSupportedException.cs</Link>
+    </Compile>
     <Compile Include="..\nanoFramework.CoreLibrary\System\Random.cs" Link="System\Random.cs" />
     <Compile Include="..\nanoFramework.CoreLibrary\System\Reflection\Assembly.cs" Link="System\Reflection\Assembly.cs" />
     <Compile Include="..\nanoFramework.CoreLibrary\System\Reflection\AssemblyAttributes.cs" Link="System\Reflection\AssemblyAttributes.cs" />

nanoFramework.CoreLibrary/CoreLibrary.nfproj

@@ -59,6 +59,7 @@
     <Compile Include="System\AppDomainUnloadedException.cs" />
     <Compile Include="System\ApplicationException.cs" />
     <Compile Include="System\ArgumentException.cs" />
+    <Compile Include="System\PlatformNotSupportedException.cs" />
     <Compile Include="System\ArgumentNullException.cs" />
     <Compile Include="System\ArgumentOutOfRangeException.cs" />
     <Compile Include="System\Array.cs" />

nanoFramework.CoreLibrary/System/AssemblyInfo.cs

@@ -13,4 +13,4 @@
 [assembly: AssemblyProduct(".NET nanoFramework mscorlib")]
 [assembly: AssemblyCopyright("Copyright (c) .NET Foundation and Contributors")]
 
-[assembly: AssemblyNativeVersion("100.5.0.16")]
+[assembly: AssemblyNativeVersion("100.5.0.17")]

nanoFramework.CoreLibrary/System/PlatformNotSupportedException.cs

@@ -0,0 +1,20 @@
+//
+// Copyright (c) .NET Foundation and Contributors
+// Portions Copyright (c) Microsoft Corporation.  All rights reserved.
+// See LICENSE file in the project root for full license information.
+//
+namespace System
+{
+    /// <summary>
+    /// The exception that is thrown when a feature does not run on a particular platform.
+    /// </summary>
+    [Serializable]
+    public class PlatformNotSupportedException : NotSupportedException
+    {
+        /// <summary>
+        /// Initializes a new instance of the ArgumentNullException class.
+        /// </summary>
+        public PlatformNotSupportedException()
+        { }
+    }
+}