Add C# files to Visual Studio projects.
Also ignore Windows native build output files.
diff --git a/.gitignore b/.gitignore
index b8ba489..220e5c3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -74,3 +74,8 @@
 # JavaBuild output.
 java/target
 javanano/target
+
+# Windows native output.
+vsprojects/Debug
+vsprojects/Release
+