Added ignored files

binding/HarfBuzzSharp.OSX/nuget/build/XamarinMac/HarfBuzzSharp.OSX.targets

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+
+  <ItemGroup>
+    <NativeReference Include="$(MSBuildThisFileDirectory)..\..\runtimes\osx\native\libHarfBuzzSharp.dylib">
+      <IsCxx>False</IsCxx>
+      <Kind>Dynamic</Kind>
+    </NativeReference>
+  </ItemGroup>
+
+</Project>