added grpc extension library for C#
diff --git a/src/csharp/.gitignore b/src/csharp/.gitignore
new file mode 100644
index 0000000..dbf38f3
--- /dev/null
+++ b/src/csharp/.gitignore
@@ -0,0 +1,2 @@
+*.userprefs
+test-results