Add props/targets

Rx.NET/Source/facades/Directory.build.props

@@ -1,4 +1,5 @@
 <Project>
+  <Import Project="..\Directory.build.props" />
   <PropertyGroup>
     <GenerateAssemblyVersionAttribute>false</GenerateAssemblyVersionAttribute>
     <CopyLocalLockFileAssemblies>false</CopyLocalLockFileAssemblies>

Rx.NET/Source/facades/Directory.build.targets

@@ -0,0 +1,3 @@
+<Project>  
+  <Import Project="..\Directory.build.targets" />
+</Project>

Rx.NET/Source/src/Directory.build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="..\Directory.build.props" />
+</Project>

Rx.NET/Source/src/Directory.build.targets

@@ -0,0 +1,3 @@
+<Project>  
+  <Import Project="..\Directory.build.targets" />
+</Project>

Rx.NET/Source/tests/Directory.build.props

@@ -0,0 +1,3 @@
+<Project>
+  <Import Project="..\Directory.build.props" />
+</Project>

Rx.NET/Source/tests/Directory.build.targets

@@ -0,0 +1,3 @@
+<Project>  
+  <Import Project="..\Directory.build.targets" />
+</Project>