added C# interop server
diff --git a/src/csharp/Grpc.IntegrationTesting.Client/.gitignore b/src/csharp/Grpc.IntegrationTesting.Client/.gitignore
new file mode 100644
index 0000000..a382af2
--- /dev/null
+++ b/src/csharp/Grpc.IntegrationTesting.Client/.gitignore
@@ -0,0 +1,3 @@
+bin
+obj
+