Add nuget packaging

NETMapnik.nuspec

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+	<metadata minClientVersion="2.5">
+        <id>mapnik</id>
+        <version>0.1.0</version>
+        <authors>Joel Brown</authors>
+        <!--<licenseUrl></licenseUrl>-->
+        <projectUrl>https://github.com/kernelsanders/NET-Mapnik</projectUrl>
+        <description>.NET bindings for mapnik</description>
+        <tags>mapnik map gis tile graphics</tags>
+	</metadata>
+	<files>
+		<file src="Release\NETMapnik.dll" target="lib\net45" />
+		<file src="Release\" exclude="Release\NETMapnik.*" target="native\x86" />
+		<file src="mapnik.props" target="build\net45" />
+	</files>
+</package>

mapnik.props

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+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+    <ItemGroup>
+      <None Include="$(MsBuildThisFileDirectory)\..\..\native\x86\*.dll" Condition="$(PlatformTarget) == 'x86'" >
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+      </None>
+      <None Include="$(MsBuildThisFileDirectory)\..\..\native\x86\mapnik\input\*" Condition="$(PlatformTarget) == 'x86'" >
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        <Link>mapnik\input\%(FileName).%(Extension)</Link>
+      </None>
+      <None Include="$(MsBuildThisFileDirectory)\..\..\native\x86\mapnik\fonts\*" Condition="$(PlatformTarget) == 'x86'" >
+        <CopyToOutputDirectory>Always</CopyToOutputDirectory>
+        <Link>mapnik\fonts\%(FileName).%(Extension)</Link>
+      </None>
+    </ItemGroup>
+</Project>