Add missing build dependency for IOG.Generation consumers

Author: AArnott

src/ImmutableObjectGraph.Generation.NuGet/ImmutableObjectGraph.Generation.NuGet.nuproj

@@ -12,6 +12,7 @@
   </ItemGroup>
   <PropertyGroup>
     <NuProjPath>$(UserProfile)\.nuget\packages\NuProj\0.10.48-beta-gea4a31bbc5\tools</NuProjPath>
+    <NuSpecTemplate>ImmutableObjectGraph.Generation.nuspec</NuSpecTemplate>
   </PropertyGroup>
   <PropertyGroup Label="Globals">
     <ProjectGuid>C2529293-7A03-4E3A-B96A-59A6D70D3B86</ProjectGuid>
@@ -46,6 +47,7 @@
     <Content Include="Readme.txt" />
   </ItemGroup>
   <ItemGroup>
+    <None Include="ImmutableObjectGraph.Generation.nuspec" />
     <None Include="project.json" />
   </ItemGroup>
   <Import Project="$(NuProjPath)\NuProj.targets" />

src/ImmutableObjectGraph.Generation.NuGet/ImmutableObjectGraph.Generation.nuspec

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2013/01/nuspec.xsd">
+  <metadata>
+    <id>placeholder</id>
+    <version>$version$</version>
+    <authors>aarnott</authors>
+    <owners></owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>to be overwritten by project file</description>
+    <releaseNotes></releaseNotes>
+    <copyright></copyright>
+    <tags></tags>
+    <dependencies>
+      <group targetFramework=".NETPortable0.0-net45+win+wpa81+wp80+MonoAndroid10+xamarinios10+MonoTouch10">
+        <dependency id="CodeGeneration.Roslyn" version="0.1.54" />
+      </group>
+    </dependencies>
+  </metadata>
+</package>