Added the XmlFormatWriter/Reader
diff --git a/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj b/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
index 06dda01..39b4026 100644
--- a/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
+++ b/src/ProtocolBuffers.Test/ProtocolBuffers.Test.csproj
@@ -83,6 +83,7 @@
       <DependentUpon>TestResources.resx</DependentUpon>

     </Compile>

     <Compile Include="CompatTests\TextCompatibilityTests.cs" />

+    <Compile Include="CompatTests\XmlCompatibilityTests.cs" />

     <Compile Include="CSharpOptionsTest.cs" />

     <Compile Include="DescriptorsTest.cs" />

     <Compile Include="Descriptors\MessageDescriptorTest.cs" />

@@ -114,6 +115,7 @@
     <Compile Include="TestProtos\UnitTestXmlSerializerTestProtoFile.cs" />

     <Compile Include="TestRpcGenerator.cs" />

     <Compile Include="TestUtil.cs" />

+    <Compile Include="TestWriterFormatXml.cs" />

     <Compile Include="TextFormatTest.cs" />

     <Compile Include="UnknownFieldSetTest.cs" />

     <Compile Include="WireFormatTest.cs" />