add needed files

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

options.go

@@ -0,0 +1,17 @@
+package drpc
+
+import (
+	"github.com/unistack-org/micro/v3/server"
+)
+
+type (
+	maxMsgSizeKey struct{}
+)
+
+//
+// MaxMsgSize set the maximum message in bytes the server can receive and
+// send.  Default maximum message size is 4 MB.
+//
+func MaxMsgSize(s int) server.Option {
+	return server.SetOption(maxMsgSizeKey{}, s)
+}