Add msbuild targets file to copy library files to the consuming project

SolcLib.Native.nuspec

@@ -16,5 +16,6 @@
     <file src="lib/osx-x64/libsolc.dylib" target="runtimes/osx-x64/native/libsolc.dylib" />
     <file src="lib/win-x64/solc.dll" target="runtimes/win-x64/native/solc.dll" />
     <file src="lib/win-x86/solc.dll" target="runtimes/win-x86/native/solc.dll" />
+    <file src="SolcLib.Native.targets" target="build/netstandard1.0"/>
   </files>
 </package>

SolcLib.Native.targets

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Content Include="$(MSBuildThisFileDirectory)..\..\runtimes\win-x64\native\solc.dll">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <Link>native\win-x64\solc.dll</Link>
+    </Content>
+    <Content Include="$(MSBuildThisFileDirectory)..\..\runtimes\win-x86\native\solc.dll">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <Link>native\win-x86\solc.dll</Link>
+    </Content>
+    <Content Include="$(MSBuildThisFileDirectory)..\..\runtimes\linux-x64\native\libsolc.so">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <Link>native\linux-x64\libsolc.so</Link>
+    </Content>
+    <Content Include="$(MSBuildThisFileDirectory)..\..\runtimes\osx-x64\native\libsolc.dylib">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+      <Link>native\osx-x64\libsolc.dylib</Link>
+    </Content>
+  </ItemGroup>
+</Project>