Add initial interop tests
diff --git a/tools/http2_interop/doc.go b/tools/http2_interop/doc.go
new file mode 100644
index 0000000..6c6b5cb
--- /dev/null
+++ b/tools/http2_interop/doc.go
@@ -0,0 +1,6 @@
+// http2interop project doc.go
+
+/*
+http2interop document
+*/
+package http2interop